Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b17550e72ea788…

MALICIOUS

PDF

79.0 KB Created: 2021-01-02 07:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38a05835098278ea6f5519e9dd7022b9 SHA-1: eebc3466ef2d28817a8a06318b37f08f084bd27a SHA-256: b7b17550e72ea788264878c28c9f720eef2e0590c6ae6cddb38ba0ac493fa2b5
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'trafffe.ru', which is suspicious. The document body, though heavily obfuscated, suggests a lure related to Excel functionality to trick the user into interacting with the malicious link.

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://trafffe.ru/123?utm_term=how+to+insert+a+column+in+excel+2010 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f896b28b0540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5faf841ea9934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381287/normal_5fe10ce43167e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5f9d08ea13a6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fa3e9160548f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5fa054667340e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474746/normal_5fb44c918cae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_5fd70d1f56146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/lego_thanos_brickheadz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4967da5a-d3a1-410d-8933-99501dcfa6b4/vocabulary_workshop_level_a_unit_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377ff539-1e87-4a66-973e-038e7452beca/76285662122.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/lafazivoxobikubavus.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/98314118256.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/dietician_courses_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/flowking_stone_blow_my_mind.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 5392 bytes
SHA-256: 61f9e6cf0a770b319b7e4d7f3808bdc68c6b64ed036022f909008448bd56c138
font_01_sfnt_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 10596 bytes
SHA-256: d5fe64428edc8ed07c39b5a39be85046df81482e23577be907b25db7fe2e1119
font_02_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 21216 bytes
SHA-256: 8b3e03c17e3a24b79d5396afc53c1742834d8bd15b79190608001f4d86dc5337

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