Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee56a7f4d568e9c3…

MALICIOUS

PDF

68.4 KB Created: 2021-02-09 09:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b9bd0179d872f13ff2085614d2d4d356 SHA-1: 93112c4b8e1f9ba5e167a65713454853b977280b SHA-256: ee56a7f4d568e9c39dfd3e672e506e13459a516168dc50a1d1d6f18241c58439
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Tamu parking pass', aligning with the PDF_SEO_LINK_FARM heuristic which often indicates phishing or scam content. No scripts were extracted, but the presence of numerous external URLs points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://seumenha.ru/123?utm_term=tamu+parking+pass PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5fe1ed877b6ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_601b3087baf30.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/ljaeLgd/tevo_tarantula_3d_printer_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fdc4bb68394e.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/wezesarerifisatise.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/5NSwij5/miwigewubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff8aaba4522a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_6018494119760.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/YrqLeTv/zombie_defense_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fe24f22ed9ac.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/eWZUhfZ/89746937654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600e5f0a61707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_5fe9c48ec9b6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475586/normal_60208cbd3c3d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 5120 bytes
SHA-256: a5d197cdbffa2ab954c792bf6d2344e35a0abe3a7ebb570c45652a8d98139c2c
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 11244 bytes
SHA-256: 83a512e97bddc3171fa8f2666f63b69a856e23e579abfb47f7ada3391c3d96c2

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