Malicious PDF — malware analysis report

Static analysis result for SHA-256 985a7eb210c78d1b…

MALICIOUS

PDF

74.4 KB Created: 2020-11-19 21:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a414ad308a0d095d53e79cfcc9643f25 SHA-1: df2cf512e7e3ac54825ccf1ba0518beacd7bd08a SHA-256: 985a7eb210c78d1b833c666f07e879eba775b0577b9c048ea7f4ba16604eb440
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'traffset.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains text related to a 'Navy chief uniform coat', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=navy+chief+uniform+coat
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f944c43a6649.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_5f9c1b4e17577.pdf
    • https://cdn-cms.f-static.net/uploads/4465555/normal_5fa67afc8ec81.pdf
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fada7f5bb9eb.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_5f9c66d23a1dc.pdf
    • https://cdn-cms.f-static.net/uploads/4470688/normal_5fae39d8863bd.pdf
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f8c541b32e90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/472415ab-ba3a-4999-bb5d-0c3c3aff4881/verorusosufifirafetiwak.pdf
    • https://s3.amazonaws.com/zugutixe/bound_by_flame_edwen_romance_guide.pdf
    • https://s3.amazonaws.com/rezugekolaba/cleveland_museum_of_natural_history_scavenger_hunt.pdf
    • https://s3.amazonaws.com/bulolimepol/chores_vocabulary_worksheet.pdf
    • https://s3.amazonaws.com/nemafu/83329863246.pdf
    • https://uploads.strikinglycdn.com/files/f2264504-7fe9-4844-9743-5c624c6358f4/xodirupibifurumase.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_off0000e79a.bin
dae537098b92a882d40f4c0d19debdb0bda129b8f1223816427f340eaf3aaa25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 5044 bytes
font_01_sfnt_off0000f8ae.bin
0c9f524c9b683d61ad5b8b40a15b7cb1e9a5c5b0836f845485a0dcd482e9e3b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 10572 bytes

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