Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d36c91404971cb…

MALICIOUS

PDF

80.7 KB Created: 2021-03-17 16:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a4eab479c64def6ac823873c26fbeaf8 SHA-1: e0125b7d6603cfe21c080fb6ef7b11c54c9673d1 SHA-256: 39d36c91404971cb9b81cda882f21cdb9aaa7e9cd39cdb32d63bc064d5d544cd
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a phone number. The presence of numerous external URIs, many pointing to disposable hosting, further supports a malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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) or Microsoft license-boilerplate 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://ponafet.ru/wix?keyword=taxi+service+long+island+city PDF link annotation
    • http://jarobadut.22web.org/robocopy_guide.pdfIn PDF document text
    • http://pokupka.space/kanda_sashti_kavasam_english_file9hyu1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fcc99fb4e3bc.pdfIn PDF document text
    • http://dmgameplan.com/gebuxidadip5xh9o.pdfIn PDF document text
    • http://cmb-eco.com/85115199084emz7c.pdfIn PDF document text
    • http://remontnatali.ru/pioneer_vsx-521_av_receivercskc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387932/normal_5ff8fea5c0253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_604a197a3ec90.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/girl_scouts_together_song_lyricshmkai.pdfIn PDF document text
    • http://dololebajug.scienceontheweb.net/ligepafapovomegen.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/english_test_for_grade_5_with_answers.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/27690978606.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
    • http://lufasojaweg.epizy.com/remozog.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_1871fd22833143f3803a2ce6a30fe21e.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_414f47ba1e2b47a5b73c7d2dd571a467.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_e96925e96fbc4f6f978930c1247d94fe.pdf?index=trueIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_68f2c09e5b0b4ac3937619bf9dbdd32e.pdf?index=trueIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_814f4c6c6b0243f99cd38fb0ed660392.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_659890e6e3864f14b9eed83fd5bf6892.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_5720e8f695524b93a759e70e72a192ef.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_65474f3be125411fa73fa9475344e28f.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_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 5076 bytes
SHA-256: 2e2caf7227d4c372fd151d9827e913bc1ccbbf446bd973d9abea5c6e443f2d30
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 11172 bytes
SHA-256: 884894fc7f48fd6dd22886845f13924057b68cdf4ccffabe7cef769c5e2a3c19
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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