Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44e7f5ae60ca602…

MALICIOUS

PDF

188.6 KB Created: 2021-04-07 23:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa78d707e11e74940fc139774ed79026 SHA-1: 93146b537d85404c42d42b9e9a4c76a9aee8020c SHA-256: c44e7f5ae60ca6027e37f5630e2092f82694dc236719647f359fc133fb453b4a
126 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, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as zajinet.ru, likely serve as phishing or malware distribution points. Although no scripts were explicitly extracted, the PDF structure and heuristic findings suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=historia+universal+freak+2+pdf+gratis PDF link annotation
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/b67ecb236b1ad.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/hdegfz2/ivan_pavlov_classical_conditioning_theory_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/dulinifijal/rRNjfha/nikukalikaf.pdfIn PDF document text
    • https://rurawovupotoli.weebly.com/uploads/1/3/4/0/134017211/bumiwuzus_wonabebiwe_bidinaxuve_zewefev.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/jdginYy/zombie_shoot_pandemic_survivor_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/d5jfeje/usa_today_crossword_puzzle_books.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/qQO7jgc/72113160907.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/heSicPI/jefaxiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/ZzMiahe/34832836569.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/ihgMtNb/c64_emulator_macbook.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/lesixasesek.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/haibvax/leap_of_faith_movie_cast.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/7a555adffa7a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_ade11122d5894ad997521565cb2100e9.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_d95ec161e32843dc93a0b45dcf940cce.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_5953726155b24ae0a58de5a5e727485d.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_a3228eb4becb4b6586a3f85f3be91979.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_6a916ea46552486f8853bb8b79c824bf.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_5d9ed8a0107948cbbeb8acec92f70990.pdf?index=trueIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_853755cc5a314262b879652d9b81c8e3.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_d7c083660e204eb1b3a5b1854cccc163.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_b7cb42a1fe174654b7001cee601e6a42.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_ae447f923b0940a4806634453fb62453.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_6ff5e38963f64dacb4526fa1c9df7868.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_37cd6046225341b48c89c67c76cf09a3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002934f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2934F 5308 bytes
SHA-256: 487294682aacdf56b05d7c3513c355cee338239865762bf0242cc01d51bbce00
font_01_sfnt_off0002a571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A571 15408 bytes
SHA-256: 8123c70f6326cf29ace93db62c5b3ff8260643b74ac6cfd0d46602e7cc466059
font_02_sfnt_off0002d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D5AB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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