Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2ec9f6ecabeccc…

MALICIOUS

PDF

56.9 KB Created: 2021-03-15 08:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ae1287e3b4d1d16fa515f5055f029a7 SHA-1: a832438cf0f4844bd4c81fc69bbf52c8c6afe4db SHA-256: 7f2ec9f6ecabeccc4cc5f5c7b0c9415367c7be89b58afc3f4b385953361d5680
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' further support its malicious intent. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8952

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=area+of+a+triangle+worksheet+metric
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    • https://cdn.sqhk.co/zimajigon/iihFQgc/nuxosatekuxanoretanofo.pdf
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    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_10c9853ef5214896bee4117967fefee1.pdf?index=true
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    • https://uploads.strikinglycdn.com/files/952a39b3-6705-4d9e-b4c4-06427b1da67f/best_bodyweight_exercise_for_arms.pdf
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