Malicious PDF — malware analysis report

Static analysis result for SHA-256 b082e4bab8191f5a…

MALICIOUS

PDF

84.0 KB Created: 2021-04-05 00:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8ce5e6062975c5c883e1a9db766c7a55 SHA-1: d335d101a692b8cb26c3bf16c993ad4cf1a15e1c SHA-256: b082e4bab8191f5a490a82a3179d448068ff9115468fbada9ec6199f01f21ad9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://kuzutuzo.ru/wix?keyword=edward+pineda+hidalgo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481402/normal_5fd38831c6c8d.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/pepumifepegegef_buguge.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/the_real_book_6th_edition.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/astyanax_aeneus.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/club_car_carryall_6.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/6853978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_604366e2ee741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454803/normal_5fd074b29fbf4.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/7910980.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/18518382888.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://susabumo.atwebpages.com/finimaxagepupuvopobutonew.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_734ee0f2fea048cc8888b40941390e9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a44238a-72fc-43bd-8b99-e9ba3d4548af/warcraft_3_cheats_custom_game.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_716dc5e984d341e19e8e2c939f481448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd655db0-78d6-48cf-a8da-21c5c9442c31/buriduxinesebilufas.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_0c10e7c3fdde4568b028ea6a9064b725.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_a5ec8d21f9c94d32a1a202e412d08339.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_f7a4ba0cf7954b3c8f6f500e8e39d666.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_ffb5f59938a548d6ab081eeb5b57cbff.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_1d954e18a99849c18bb0a4a5bef70492.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea81006-8763-43e0-8e28-2281cdd33f7c/radical_acceptance_what_is_it.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 4800 bytes
SHA-256: 627d94d65b71522e1f363c670228fe6008987a6e58fb12a9b9f7070ffe97aa26
font_01_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 11272 bytes
SHA-256: 853bb6c1cec2346876b962c404b3a23dc607fcd757285adba76c3b4b4c007459
font_02_sfnt_off000134cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3