Last week, I found an interesting piece of phishing based on a PDF file. Today, most of the PDF files that are delivered to end-user are not malicious, I mean that they don't contain an exploit to trigger a vulnerability and infect the victim's computer. They are just used as a transport mechanism to deliver more malicious content. Yesterday, Didier analyzed the same kind of Word document[1]. They are more and more common because they are (usually) not blocked by common filters at the perimeter.
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Simple PDF Linking to Malicious Content, (Mon, Apr 25th)
Last week, I found an interesting piece of phishing based on a PDF file. Today, most of the PDF files that are delivered to end-user are not malicious, I mean that they don't contain an exploit to trigger a vulnerability and infect the…
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Syntax validiert (0 Fehler)
title: Detect Exploitation - Simple PDF Linking to Malicious Content, (Mon, Apr 25th)
id: a7b4d24b-05a0-4e50-b578-c1f9028d8313
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-26
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_access
- attack.t1566Syntax validiert (0 Fehler)
rule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-26"
description = "YARA Signature for "
strings:
$str = "Simple PDF Linking to Maliciou" ascii wide
condition:
any of them
}Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Simple PDF Linking to Malicious Content ")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - countSyntax validiert (0 Fehler)
message: "*Simple PDF Linking to Malicious Content *"Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "Simple PDF Linking to Malicious Content "
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc2. Cyber Threat Intelligence & Forensik
CTI Threat Relationship Graph3 Knoten / 2 Relationen
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MITRE ATT&CK Matrix Navigator 14 Taktiken
Reconnaissance
-
Resource Development
-
Initial Access
Execution
Persistence
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Privilege Escalation
Defense Evasion
Credential Access
-
Discovery
-
Lateral Movement
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Collection
-
Command and Control
Exfiltration
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Impact
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Simple PDF Linking to Malicious Content,.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
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- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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