Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c265eec97c5fda…

MALICIOUS

PDF

184.6 KB Created: 2021-05-21 12:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b024877b903d2f040a76a03ca23de1e SHA-1: fe3472349df219388d2e5e4230b74f3475a8077e SHA-256: c8c265eec97c5fda5902d39b9233b1548a514379d32c31d7836c7066fb48e1c7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, many pointing to disposable hosting or unknown reputations, suggest a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external URIs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

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://golowaki.ru/strik?utm_term=rebelion+de+tupac+amaru+ii+resumen PDF link annotation
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    • https://s3.amazonaws.com/jaxesabi/tigumugafenijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c07983e-34c4-4ded-a7dc-5354d6712193/40524760463.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/que_es_composicion_en_arquitectura.pdfIn PDF document text
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