Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5d201058e8a4ac…

MALICIOUS

PDF

85.5 KB Created: 2021-03-12 13:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09b782c00b12452ad77692f716b30828 SHA-1: 8918335d8a1058be8daeaf30b5604d0866f5d331 SHA-256: 8b5d201058e8a4acb4ac0e915f4f8b7fe4fde38bcf34ffb953e4c7e8a1485f0a
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Assassination pvp guide' and the authoring application 'wkhtmltopdf', suggesting a lure. The primary IOC is an external URI pointing to 'ponafet.ru', which is likely part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/wix?keyword=assassination+pvp+guide
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5feb365404fc3.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601745273b278.pdf
    • http://mujododaziwato.scienceontheweb.net/dutepajisiposowinuzan.pdf
    • http://gakagebir.mypressonline.com/how_to_get_a_spanish_teacher_certification.pdf
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/1db59d511e4a.pdf
    • http://xudikuruno.iblogger.org/camera_eyewear_v13_driver.pdf
    • http://naropiwazufilu.22web.org/fire_evacuation_drill_analysis_report_template.pdf
    • http://pofuxubilet.sportsontheweb.net/bowflex_power_pro_leg_workouts.pdf
    • http://sorifaj.22web.org/samsung_galaxy_s4_mini_price_argos.pdf
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/af8d5d1a.pdf
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fd0813240cff.pdf
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/mokopax.pdf
    • http://serururepus.scienceontheweb.net/74647798525.pdf
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5fed3413c53f5.pdf
    • https://static.s123-cdn-static.com/uploads/4419826/normal_5ff88c6a01869.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pogetowem.onlinewebshop.net/48592253188.pdf
    • http://vexolofifete.atwebpages.com/planet_fitness_member_contract.pdf
    • https://uploads.strikinglycdn.com/files/377e4c16-80a9-401f-ab08-9cc33f287d02/muwuwunelirezokodolulew.pdf
    • https://uploads.strikinglycdn.com/files/a01aa843-3540-43f7-8395-c55eb73c089f/92419372321.pdf
    • https://uploads.strikinglycdn.com/files/55d7cca0-b77d-479b-95bd-568d15bdca47/mortal_engines_2_full_movie.pdf
    • http://damikofem.rf.gd/rovedireko.pdf
    • https://uploads.strikinglycdn.com/files/8cd67719-956d-4fed-9d15-0a658d8b38bc/raymond_queneau_exercices_de_style_texte.pdf
    • https://uploads.strikinglycdn.com/files/56a26f70-6a9a-4f82-b8de-e6e60795a214/33140788825.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_off00011250.bin
743c4b52e7c7b79983a3406370fc53d2cfcea04e3c1cf6f177f8f1e47695c381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 5048 bytes
font_01_sfnt_off0001239f.bin
fcb74e3deb0a09e600f28a3f4aa0f808910a851b5ea49644b679371dfe720bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 10692 bytes

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