Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8f4a05baba569d…

MALICIOUS

PDF

139.6 KB Created: 2020-11-30 20:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7578eb287618aff06949bea01482bad SHA-1: 914e923a7ff1c61824bca28f0b87c67c3276b34a SHA-256: 1a8f4a05baba569d563586e5e2895396784fa44f9ab4c397012260668ab074e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. ClamAV detected it as 'Pdf.Phishing.Trojan', and ML classification also flagged it as malicious. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8451

Heuristics 4

  • 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
  • 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://trafftec.ru/aws?utm_term=traditional+chinese+characters+pdf
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/poritir_zebon_xowefon_xejago.pdf
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/bc381e53477.pdf
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/48da0.pdf
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/degotobogaduto.pdf
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fc10f73fa04221c71454882/1606487925050/songs_from_hairspray_2007.pdf
    • https://static1.squarespace.com/static/5fc016b9c30a162e0c4e17a3/t/5fc0e3b1e6d49a06bbb2d489/1606476725833/31669856887.pdf
    • https://s3.amazonaws.com/ninasivol/zogepovenazokatisoded.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1e2377802d38de32e8d6/1606229540003/dajonojizinofutetin.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf590c4e98326c0207b879/1606375693421/immigration_paralegal_books.pdf

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