Malicious PDF — malware analysis report

Static analysis result for SHA-256 505406d4b9e80777…

MALICIOUS

PDF

69.2 KB Created: 2020-11-26 08:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d523ee523badf9493b93c1402ea78416 SHA-1: d8915e8e623b016b0c21a374325e43a120daf23f SHA-256: 505406d4b9e80777e016c84971b0b41f65711b9909d1da4d34e0fa8113e80f8e
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'inflectional endings games' and the wkhtmltopdf application, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=inflectional+endings+games
    • https://cdn-cms.f-static.net/uploads/4478125/normal_5fa5945711da0.pdf
    • https://cdn-cms.f-static.net/uploads/4425915/normal_5f9d97d1ef74f.pdf
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5fa3ac6f69677.pdf
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5f91ab4626d40.pdf
    • https://cdn-cms.f-static.net/uploads/4451227/normal_5f9ec5d96d090.pdf
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f9771cc9ca70.pdf
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f929415e3b3f.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_5fbc0e656975e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wapabefizosumi/catio_plans.pdf
    • https://s3.amazonaws.com/rebomedug/colgate_palmolive_annual_report_2018.pdf
    • https://s3.amazonaws.com/jufowokedunod/a_confession_tolstoy.pdf
    • https://uploads.strikinglycdn.com/files/fa9d6bae-28b0-4d55-b54a-99987592fe10/51020430029.pdf
    • https://s3.amazonaws.com/najipavez/8262525074.pdf
    • https://s3.amazonaws.com/pirofopafu/brightness_control_mac.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_off0000d18b.bin
fd097ab5767a6f54c2b572af3690636b9097a01f5291ec164c5353524ae24844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 5184 bytes
font_01_sfnt_off0000e325.bin
2939fb3e3c866e26b3e7a56911336f50815e7bc449ddea486365e722554ec0ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 10952 bytes

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