Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9899a3cb21f292…

MALICIOUS

PDF

119.8 KB Created: 2021-03-14 23:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27c31e9dde5bdecb80628945b73d67ee SHA-1: 7c68e42e21368bbd8473102a5630611be14a36bf SHA-256: 2c9899a3cb21f2921f38a020e583f069b0ab91fa0a799a7910ccf3c47cc6a91c
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, indicating it's a phishing or trojan PDF. It contains an external URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=liberalismo+clasico+pdf
    • http://zugemenelil.medianewsonline.com/asvab_for_dummies_2020_free_download.pdf
    • http://lakujalinifibo.mypressonline.com/tinurupenalexatazowipet.pdf
    • http://trynutra.shop/54758382302emmg2.pdf
    • http://bejisosubonito.sportsontheweb.net/jowerefa.pdf
    • http://saudiautoinsurance.com/20020542008gpgv4.pdf
    • http://mitisavad.getenjoyment.net/how_do_you_find_the_enthalpy_change.pdf
    • https://cdn-cms.f-static.net/uploads/4487903/normal_60129914db7ec.pdf
    • http://rabizepafuxonag.mypressonline.com/86010090238.pdf
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fce820dae0de.pdf
    • http://rorogudadusosej.getenjoyment.net/linux_awk_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4371786/normal_604b6fecea046.pdf
    • http://swiss-family.space/the_primary_users_of_management_accounting_information_are5noz9.pdf
    • http://jerimujolegem.medianewsonline.com/rig_veda_book_in_sanskrit.pdf
    • http://rubyshup.space/aetna_better_health_nj_provider_dispute_formw1uro.pdf
    • http://feyakast.online/razowovibi7m6uk.pdf
    • http://help-bluebadgecenter.com/45690330298px8b9.pdf
    • https://cdn-cms.f-static.net/uploads/4413563/normal_601bc9921be7a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajeloninesitel/82794008193.pdf
    • http://vorisenunajix.myartsonline.com/68692462215.pdf
    • https://s3.amazonaws.com/dazuxujepov/38379956136.pdf
    • https://s3.amazonaws.com/bubisifapagefe/86511402355.pdf
    • https://s3.amazonaws.com/widiku/92891633192.pdf
    • https://s3.amazonaws.com/rufonali/how_to_disable_key_fob_alarm.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_off000194b7.bin
6f1d80ccfbcd6f5a0b22bbc77faf469e9d53f583536969e79fb4c34376ac5dc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x194B7 5384 bytes
font_01_sfnt_off0001a6eb.bin
17f2084eee96093450321999075127b22dede1f192c6124910d79acdb283c0f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6EB 13796 bytes