Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c5e472a2cfaab8…

MALICIOUS

PDF

70.4 KB Created: 2020-11-20 07:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68d7584afc51b1f4c12b2a87a9569296 SHA-1: 90e57c7f8d5faac5836f0d9002bd1c488e34bbf0 SHA-256: 50c5e472a2cfaab82b9de1715a3adf28dbc5d549734827c85abc3b6d87b0f22f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?utm_term=gamme+guitare+tablature+pdf'. The document body, though heavily obfuscated, suggests a lure related to 'Gamme guitare tablature pdf'. The ML classifier and ClamAV detection further support the malicious nature of this PDF, indicating it's likely used for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=gamme+guitare+tablature+pdf
    • https://cdn-cms.f-static.net/uploads/4493541/normal_5fb415370c3cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/navoburarovada/english_dictionary_app_for_computer_windows.pdf
    • https://uploads.strikinglycdn.com/files/31d336be-e911-4a3a-b390-1e67481cb1b1/testament_of_vanear_p99.pdf
    • https://s3.amazonaws.com/wanalovum/illinois_lottery_4_digit.pdf
    • https://s3.amazonaws.com/pizexopenaxu/lovudutuvuxezagem.pdf
    • https://s3.amazonaws.com/wonoti/17005503650.pdf
    • https://uploads.strikinglycdn.com/files/e2c8ef30-6d7c-4f23-8904-ce296268420f/91020741204.pdf
    • https://uploads.strikinglycdn.com/files/b8de8f4a-b82c-4bcc-9aa9-8b4061001ba5/a_perfect_life_by_danielle_steel.pdf
    • https://uploads.strikinglycdn.com/files/cfb31c91-c752-430e-a3ab-66c514e27f40/xixajifedukafogitorapeju.pdf
    • https://s3.amazonaws.com/wefadep/use_chmod_to_make_file_executable.pdf
    • https://s3.amazonaws.com/pazovugal/79762582699.pdf
    • https://uploads.strikinglycdn.com/files/03135b0c-1b95-4bd4-9541-0ba2302f04d9/19439558246.pdf
    • https://uploads.strikinglycdn.com/files/c6f5d8a8-47be-464f-9f4e-76fb1821e509/one_solitary_life_poem_jesus.pdf
    • https://uploads.strikinglycdn.com/files/dcee3fa9-1af5-4ca2-9d85-0143689e4621/59275283925.pdf
    • https://s3.amazonaws.com/gizonukorad/daily_reporter_coldwater_michigan_obituaries.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f7.bin
77029c9f13396cbf68d3e43dfcaf872a4d054d65a2fc78e0d240098adf656694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 5020 bytes
font_01_sfnt_off0000db14.bin
120083be3d7b5bf510797dc5eb33a93bc4c8a13d49cb8e792ca06102cf633e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 10444 bytes
font_02_sfnt_off0000fea6.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 4324 bytes

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