Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a0bf6f80f5a079…

MALICIOUS

PDF

75.7 KB Created: 2021-04-01 14:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4279525a26910730babcc4f6a6156876 SHA-1: b9d87f1f6778969386ae65a142755f9c20e4a801 SHA-256: 50a0bf6f80f5a07931139fb6d0d909018987f184e44831c06630efbf81917f4b
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL pointing to 'botokaw.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'set theory book pdf'. No scripts were extracted, but the PDF structure and heuristics indicate malicious intent.

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://botokaw.ru/award?keyword=set+theory+book+pdf
    • https://cdn.sqhk.co/pinofizulag/hiicgjm/56980821823.pdf
    • https://cdn.sqhk.co/banifiga/Njfnqhf/33759022788.pdf
    • http://lipexifinidoda.scienceontheweb.net/xalalozaroniwimapaka.pdf
    • https://cdn-cms.f-static.net/uploads/4416150/normal_600a58341d8e7.pdf
    • https://cdn-cms.f-static.net/uploads/4421944/normal_603b7d03037ca.pdf
    • http://wapadax.scienceontheweb.net/62634356791.pdf
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/semusukitotixi.pdf
    • http://sowoxapexemex.sportsontheweb.net/edward_said_crisis_in_orientalism.pdf
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/174608.pdf
    • https://cdn.sqhk.co/xiroxozalal/jdJghb9/gitaxiralatixurarik.pdf
    • https://cdn.sqhk.co/dukoredod/0mgeigV/mini_racing_adventures_hack_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_b62b4e02affb428ba83ab6e625d5df75.pdf?index=true
    • http://kafotafuvodalix.onlinewebshop.net/12954576292.pdf
    • https://uploads.strikinglycdn.com/files/55f2dc7e-c119-41cc-9d95-ab577f7bf6b7/lolobuxunexi.pdf
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_7b4f47f533ef4c9f87880f87fe91036c.pdf?index=true
    • http://jeximojela.myartsonline.com/weferiwola.pdf
    • https://uploads.strikinglycdn.com/files/e01b18a5-8fce-4263-a9c7-684d2709cb28/wexubuwigitefituletevolax.pdf
    • https://uploads.strikinglycdn.com/files/ef409c9e-6bb0-4dda-b042-3e9322683155/xumikoduxitula.pdf
    • https://uploads.strikinglycdn.com/files/dd4d7290-e0e1-4d3f-9d6e-d98cb3a3f288/how_would_you_describe_lennie.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d461.bin
774eb15c1e35875c19126126671c192b70792984da9c253e7539f75f31d228a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 5120 bytes
font_01_sfnt_off0000e5ce.bin
9c3a046d9d9ceb0384e68ad12e401c92731dc6eedf5c17cce9844fca76c75f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10828 bytes
font_02_sfnt_off00010b4b.bin
3ba1ba81b61094e509664bc186deab37c024772d8e076c0980ad4a9156f23f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16320 bytes

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