Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a9f7b617970b13…

MALICIOUS

PDF

84.9 KB Created: 2021-02-27 15:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 393f4b3ffa381e5743d31c2ec78d889b SHA-1: adf7e0c39f2999c20c9fd98843eb081e2d4d8cf0 SHA-256: c5a9f7b617970b130da317a4bf700710860f4b790670c7ce72dabfb565754e53
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/123?utm_term=best+way+to+solve+physics+problems+faster PDF link annotation
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/sijivozixobugiw.pdfIn PDF document text
    • http://prodit.space/gazetted_officer_certificate_for_aadhar_cardd31fe.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/5f6d754.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/fkjjXcn/wixela_generic_dosage.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/eheeOed/67203840966.pdfIn PDF document text
    • http://igcopyrightforhelps.com/55407638773mmjoa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_5fe99d9a4fc2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_6029d95425d7d.pdfIn PDF document text
    • http://francobusiness.com/multifactor_leadership_questionnairemvxcw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_6028018c39eec.pdfIn PDF document text
    • http://groshyk.site/bahubali_song_mp4_tinyjukem9obd.pdfIn PDF document text
    • http://afracheat1.xyz/votukutuvonaxarubaxulojr3hg5.pdfIn PDF document text
    • http://dlkmvkoenv.info/pebble_watch_301bl_priceawh9w.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/vilunuweguzovav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_5fd634b355417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bajuse/6800742948.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 5696 bytes
SHA-256: a1ddf93062dbb4b7fc16e47c10a6e04ab9611ea4ab068440acf39aad92f72e3a
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10940 bytes
SHA-256: 2efc018413de51a789e0f18e05a8bc2b2dce58f6485ad2b99e31fa826140c842

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