Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a6fa3cd53f2b8b…

MALICIOUS

PDF

65.0 KB Created: 2020-12-06 09:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47e36cf442790ca69110510bc7c9471c SHA-1: 17c7fcbbf5955d8f5c1491bc876477466c40e5c5 SHA-256: a8a6fa3cd53f2b8b633cd848cd1311e36ba08d913c9362217e43f7269578e6b4
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI pointing to 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit users through deceptive content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=prime+factorization+of+6561
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5fa9131540f67.pdf
    • https://cdn-cms.f-static.net/uploads/4462993/normal_5fb60051209aa.pdf
    • https://cdn-cms.f-static.net/uploads/4393022/normal_5f9cc1d3efcf1.pdf
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fa58032c8851.pdf
    • https://static.s123-cdn-static.com/uploads/4375894/normal_5fcba62fa7b70.pdf
    • https://cdn-cms.f-static.net/uploads/4473632/normal_5fbf290f225d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/titugome/2234770262.pdf
    • https://static1.squarespace.com/static/5fc55bc327a199023ad316a3/t/5fc96e7b44b6661e4fc5169a/1607036539812/bank-_subterfuge_crossword_clue.pdf
    • https://s3.amazonaws.com/libeganot/my_lil_bastard_android.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe161cbc819f1cf4a0ad09/1606293021309/bell_bike_speedometer_manual.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_off0000c2ab.bin
0020035b1fd36afc62ffb03beeb77618cdcf888e3b0d8e062de3bfa535245d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 5196 bytes
font_01_sfnt_off0000d458.bin
42ea53bad10fd4cf3197df739cd4e4320f45d539b32310c22a0a62df2f4aa229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 10480 bytes

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