Malicious PDF — malware analysis report

Static analysis result for SHA-256 c259b17e59888238…

MALICIOUS

PDF

67.2 KB Created: 2020-11-22 05:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f279abe5863ba33d87e6a420ea081cb1 SHA-1: c8e6984d944d7818abd12a5b412ee7305da82b7e SHA-256: c259b17e598882383f36410cd3e73afd4db82a85778dc2128f172d3f06c29c85
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafffi.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The PDF structure itself is also noted for duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafffi.ru/aws?utm_term=context+clues+example+sentences+answers
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f9b06eb3fae7.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f93d91bb3b76.pdf
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8758008de04.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5fa573725ab3d.pdf
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fb2b2bba030b.pdf
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5fb498425a7dc.pdf
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5fb97c8df1a36.pdf
    • https://cdn-cms.f-static.net/uploads/4425230/normal_5fb53837e7e90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuliwisuwig/juwigereg.pdf
    • https://uploads.strikinglycdn.com/files/cd0656e5-3fca-47d3-a088-2fc30896b7c1/lg_tool_crack.pdf
    • https://uploads.strikinglycdn.com/files/9e75b41e-ecfd-469f-9ad2-4b066db9dd1e/externship_office_wcl.pdf
    • https://uploads.strikinglycdn.com/files/911bccef-fa6f-434a-937a-21208cec5371/bedagefefasafijawigepi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc90.bin
e420776c1931cbc24ec58426363e5e705d707e350a03c9ccb96c3e297219c5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 5144 bytes
font_01_sfnt_off0000de0b.bin
c35c9b977434b58a5bd1fcf84071d06586e7e345d35dd7b91eafd972cac9e9bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 9872 bytes

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