Malicious PDF — malware analysis report

Static analysis result for SHA-256 5171404d9a04ac56…

MALICIOUS

PDF

83.9 KB Created: 2020-12-27 03:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a82937ad49373a5c9d096a15b1839f12 SHA-1: 1fc5f5b7b98b695b78d6bfbe1a379dc13d47c041 SHA-256: 5171404d9a04ac5640c54253d74f690c2fbbdecc6cecda30151239bcb8218108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to a 'Sram rival groupset for gravel bike', which is likely a lure to direct users to malicious or deceptive websites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffine.ru/123?utm_term=sram+rival+groupset+for+gravel+bike
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5fe4c4338763e.pdf
    • https://cdn.sqhk.co/kuzosexiwugu/Wp9Magi/maparowozaroja.pdf
    • https://static.s123-cdn-static.com/uploads/4498376/normal_5fcbf88330998.pdf
    • https://sigegasolo.weebly.com/uploads/1/3/4/7/134732441/gapewogikaj_lozupopisozez.pdf
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f87059074348.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/516d2342-459a-46fe-a77e-faf96a9238c9/42627825286.pdf
    • https://uploads.strikinglycdn.com/files/bcf2c925-6e7c-4a66-8feb-e06199a34b1e/nadavezodevalaxus.pdf
    • https://uploads.strikinglycdn.com/files/bcc01c1a-d38c-4506-8362-957e81de99fd/midnight_in_paris_parents_guide.pdf
    • https://s3.amazonaws.com/widiku/xidimijiselajesok.pdf
    • https://uploads.strikinglycdn.com/files/d8d710b0-9ad2-4009-901b-20d834d66b41/nazefakaruwogigowemenen.pdf
    • https://uploads.strikinglycdn.com/files/ae2060fd-826f-4498-a67e-43e34c58e2f5/youre_killin_me_smalls_svg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd54.bin
7fcaf9c1712046053959b90d5a024b9564b190f5adb00561a4d57d13f21129e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 5364 bytes
font_01_sfnt_off00010f98.bin
ae38a3fe0d0dae1f66ffb3dc54615dbb9d34c27ea321329124c1ef6de257715d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10768 bytes
font_02_sfnt_off0001345c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1345C 4324 bytes