Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c435583e1e718a…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 09:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b011acaf05f74f152de85b5950cdd97 SHA-1: 972a8a52a1057a5cde152fc2df3ed545944c6051 SHA-256: e0c435583e1e718ae2bd8f8d649e8c97927dc2c7f80fb4f86ae42aa56d45b0be
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, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jumiwimov.ru/wix?keyword=abduction+of+thumb+muscle', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://jumiwimov.ru/wix?keyword=abduction+of+thumb+muscle
    • http://starkrobotics.org/14634515965m7l9a.pdf
    • https://cdn-cms.f-static.net/uploads/4449998/normal_6029821ec43ae.pdf
    • https://static.s123-cdn-static.com/uploads/4413575/normal_6007d6d59236d.pdf
    • https://cdn-cms.f-static.net/uploads/4416326/normal_6039e4f726e67.pdf
    • http://unreguezff.rest/18969202721m5oxk.pdf
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fc5b25e19526.pdf
    • http://itwow.info/54783542346k1g4p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9cbb8290-a602-4ea7-91bb-8708e061a3c2/love_is_a_fallacy_by_max_shulman_1951.pdf
    • https://uploads.strikinglycdn.com/files/11807c7c-451c-4c06-8071-2c8f5b1215ec/lakamigipejerof.pdf
    • https://uploads.strikinglycdn.com/files/1c0099c0-ee74-4baf-857f-d9da69208714/24886965793.pdf
    • https://uploads.strikinglycdn.com/files/5139b2b0-4fc0-4b08-b28a-85c6b891c94f/xutikikelijatatuxumipopa.pdf
    • https://uploads.strikinglycdn.com/files/c5ba93c8-58c6-459a-abee-50c393cdd9c2/vuzaledejarerunesalag.pdf
    • https://uploads.strikinglycdn.com/files/de40831d-6b10-4949-b358-7223ad99f361/recaro_performance_sport_car_seat.pdf
    • https://uploads.strikinglycdn.com/files/d3008a92-575f-403b-a6cd-fbf85cff09ae/how_to_install_driver_on_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/6358ea5a-b1f8-4134-bf1c-c6a95c8d98c6/dipobusavu.pdf
    • https://uploads.strikinglycdn.com/files/a3db90bb-14ed-444d-b303-140d237fd8f1/kitinujisenojojonaki.pdf
    • https://uploads.strikinglycdn.com/files/5ec82652-1b29-4022-814c-fbb8064cb8b0/genajutudeke.pdf
    • https://uploads.strikinglycdn.com/files/bd1b3bf2-6b8b-467f-8f8f-29256878c7d8/wavipunisenonupame.pdf
    • https://uploads.strikinglycdn.com/files/7e20df9b-14e9-429b-b9a1-e4ac33eef76f/dbt_therapy_meaning.pdf
    • https://uploads.strikinglycdn.com/files/df6fedc2-45b5-4ba8-a571-e3453441a016/boxuviwopozalugotutimexa.pdf
    • https://uploads.strikinglycdn.com/files/d4642dc2-bde2-4180-ace6-97c2502efaad/19775695250.pdf
    • https://uploads.strikinglycdn.com/files/f15a124e-d447-4c7c-a3e4-bb83b71fa207/noco_genius_boost_gb40_how_to_charge.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_off0000f637.bin
011325f6aef05b8475216206948ff064a9dfb98fad45e6da5485b5d587b5a98a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 5084 bytes
font_01_sfnt_off00010767.bin
c11faeb56d5bafd4835a2c7c828e597c611a92cce549d68355f1f94b9dd0c1df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 11124 bytes

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