Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb625475a9b2479f…

MALICIOUS

PDF

67.6 KB Created: 2020-12-11 19:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94d6b1e17d4f4cd8611ab1bbf7cad233 SHA-1: 5c34653dc67b635939a86b4dd4ccc183f00adfed SHA-256: fb625475a9b2479f23aa5dee162c583d6f5d9a9f0865640050c172279e0f6d60
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=hr+manager+job+description+template
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/f230e71486.pdf
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdf
    • https://turamidiwirak.weebly.com/uploads/1/3/4/3/134340523/149e3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ca44231-5fd2-42cf-912a-7b2cebca62b0/86607669107.pdf
    • https://uploads.strikinglycdn.com/files/cc0861d5-9c9d-4c3a-af26-c416301811d9/solagewubudapogonuvavob.pdf
    • https://s3.amazonaws.com/fifomi/donkey_kong_unblocked_games_76.pdf
    • https://uploads.strikinglycdn.com/files/e43a037a-54fe-4a25-8e5f-28412c2e78f6/42076217266.pdf
    • https://static1.squarespace.com/static/5fc3a46c8139af037656512a/t/5fca375c9c93c058c48ec845/1607087973261/76100267259.pdf
    • https://uploads.strikinglycdn.com/files/b07a571b-a94c-4e60-9ee5-7f1aa3bfeabd/mityvac_7201_problems.pdf
    • https://static1.squarespace.com/static/5fc10f0fab79f442f22a8155/t/5fc3369abc819f1cf44159f3/1606629018514/dakebumubuzo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f562.bin
034ceabd1df7a6612b2db7b15fbc3853c487573f61234eb8f2e69fea0171b43c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 5568 bytes

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