Malicious PDF — malware analysis report

Static analysis result for SHA-256 da24760bdda6307c…

MALICIOUS

PDF

83.3 KB Created: 2021-06-05 15:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 609c3f94075e59ccd68db2911937d7bf SHA-1: 5df78474d3477148bfe2bd7a8615bfa2cf6ce17d SHA-256: da24760bdda6307cc01e0d89a149b09cd0ed3308e9cfbfe1af87aa927c9bce1d
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/pbw?utm_term=hand+embroidery+designs+free+download+pdf
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/94e1e22272.pdf
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/febag_varefeluto_pimuwusadanemut.pdf
    • https://xipajiwevupo.weebly.com/uploads/1/3/4/0/134012925/7919389.pdf
    • https://fexejazawipezes.weebly.com/uploads/1/3/4/8/134869354/01abf30b09e286.pdf
    • https://static.s123-cdn-static.com/uploads/4417662/normal_6001f66c97d12.pdf
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/0de7db92ddf.pdf
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5ff23f400b7cc.pdf
    • https://rijivujebevobog.weebly.com/uploads/1/3/4/4/134488471/7709c.pdf
    • https://cdn-cms.f-static.net/uploads/4403259/normal_5fe8b9585bbbb.pdf
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/gupasuwemada.pdf
    • https://luludexo.weebly.com/uploads/1/3/5/3/135322363/9588867.pdf
    • https://kexawugidatenak.weebly.com/uploads/1/3/4/3/134338825/xojeman.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cfb5ade3-77c8-4d87-81ca-682230a8c759/zivebekedilepepidi.pdf
    • http://fotikeralo.pbworks.com/f/technical_analysis_and_stock_market_profits_by_richard_schabacker.pdf
    • http://lopofemusun.pbworks.com/f/wedubilo.pdf
    • https://uploads.strikinglycdn.com/files/939fe335-1cd7-4f44-91f9-4bcd37802da5/possessive_pronouns_quiz.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144412035/headway_pre-intermediate._workbook_with_key_5th_edition.pdf.pdf
    • http://sutodoromar.pbworks.com/w/file/fetch/144506187/racine_carre_de_728.pdf
    • https://uploads.strikinglycdn.com/files/9da3e20f-db52-435e-bdd2-d543c3017317/87516155229.pdf
    • http://padimagofo.pbworks.com/w/file/fetch/144453252/pevawokavetorimadisapax.pdf
    • http://rukuvekuke.pbworks.com/f/80445391576.pdf
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411855/homonyms_worksheet_for_grade_3.pdf
    • http://jizakatum.pbworks.com/w/file/fetch/144483489/comment_calculer_la_longueur_de_la_hauteur_dun_triangle_equilateral.pdf
    • http://mutoteja.pbworks.com/w/file/fetch/144624624/paw_patrol_chase_police_cruiser_6v_instructions.pdf
    • http://mumubib.pbworks.com/w/file/fetch/144413322/cambridge_first_certificate_in_english_3_with_answers.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_off0001065b.bin
3cc183a70091c79344db96fc17da2b51fd63a24b9cf94a80f9c25a81d8fb8628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 5656 bytes
font_01_sfnt_off00011992.bin
a6aa1477ee88efed7e1f1430f485b412922419479ee3cd568bce7eedb26a6041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 11288 bytes

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