Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe32efe68c601b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 02:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5f72faa1d8f35fc22bbfc7b607f34bb SHA-1: 7ecddf9a9c5b44557c47e4c8548d45797057cb15 SHA-256: d9fe32efe68c601b4c9d4c498990d101d66cdce459546f41b40803b6cfc43533
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious SEO link farm, containing numerous external links designed to direct users to other PDF files. The presence of a callback phishing lure heuristic suggests a potential for social engineering. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=playground+safety+lesson
    • http://labiosdewonda.com/rca_universal_remote_control_codes_fupv1b.pdf
    • http://erkutungotu.com/24569428051yskkl.pdf
    • https://cdn.sqhk.co/jeforije/ygewjeu/bivalukixo.pdf
    • http://baffer-shop.space/baduxa1wbzj.pdf
    • http://ecoterritory.store/resumo_do_livro_inteligncia_emocional_daniel_golemanrw1hd.pdf
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/ac2cd775a336d48.pdf
    • https://kutikeso.weebly.com/uploads/1/3/4/4/134490414/kofevanawijuwipaled.pdf
    • https://xiluruzubu.weebly.com/uploads/1/3/0/8/130813732/b6f06d4e208c7f0.pdf
    • https://konoxitewe.weebly.com/uploads/1/3/4/4/134494736/2953747.pdf
    • http://hookup755.fun/it_stephen_king_castugmh0.pdf
    • https://tolonatapuxid.weebly.com/uploads/1/3/4/0/134042297/b7e56.pdf
    • http://bejisosubonito.sportsontheweb.net/puviwaximaxeduw.pdf
    • https://cdn.sqhk.co/fomanazoravu/hcbJege/simple_lasagna_recipe_with_lasagne_sheets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mukanebesiva.atwebpages.com/linear_algebra_with_applications_9th_edition_chegg.pdf
    • https://s3.amazonaws.com/zidosozawok/mp_bed_entrance_exam_form_2019.pdf
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_de56346d2a264c419a49e1b81f78a296.pdf?index=true
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_6ebb3d4d41c5435a9343e61fbda6813f.pdf?index=true
    • https://s3.amazonaws.com/dadupawo/restore_google_chrome_history_android.pdf
    • https://s3.amazonaws.com/paxuvagal/18167576105.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_6101d006089c447f998ad49906826960.pdf?index=true
    • https://s3.amazonaws.com/rodakarugupoko/low_carb_cheesecake_nutritional_information.pdf
    • http://jigisasamupor.onlinewebshop.net/50402167208.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_off0000f1d6.bin
c890667a40351f89ab36954e94389ee135f5cfdb2c07cb9492a182d7f99712ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 5180 bytes
font_01_sfnt_off00010391.bin
bf8e5c04d97a2f8862d4b01e7919a97fc046f8d2fa70dce329018685e5696b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10836 bytes

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