Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edf633924b138f1…

MALICIOUS

PDF

83.6 KB Created: 2021-04-30 20:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19d08a531a6ac92e667880fdcb89c96b SHA-1: 66c6a3a2b81510f52ff14fd7a74eb632e3bef2c8 SHA-256: 5edf633924b138f141a679e6d57e0ca6a7825979b8cbd7d2f6dd097d20651b3c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6182

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=what+are+the+benefits+of+cooperative+learning+strategies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490523/normal_603fcfbe5e621.pdfIn PDF document text
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    • http://drive4mclanemilwaukee.com/libro_de_filosofia_2_bachillerato_resueltoxm4v6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5ff205365162d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_6016ca058853b.pdfIn PDF document text
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    • https://cdn-cms.f-static.net/uploads/4379726/normal_5fdb6dfd1c902.pdfIn PDF document text
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