Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4eb99a28ecc0ba…

MALICIOUS

PDF

91.4 KB Created: 2021-03-20 18:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e2538c703b46b5fb8b65c1ba10fd8e6 SHA-1: d04f87d9de029020275a3d49da08935e48d56aff SHA-256: ef4eb99a28ecc0ba80c43df75602652d7bf7375bd284351277041677c29919f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://bologen.ru/award?keyword=working+of+2+stroke+petrol+engine+pdf
    • https://cdn.sqhk.co/fizuborugas/zgchfPC/all_my_stickers_on_snapchat_are_gone.pdf
    • http://widutojudowixum.22web.org/82283646468.pdf
    • https://cdn-cms.f-static.net/uploads/4384160/normal_600a0d99503a6.pdf
    • https://static.s123-cdn-static.com/uploads/4381287/normal_5ff9c1daa7043.pdf
    • https://cdn.sqhk.co/moturalogupe/Ihb7lz8/cara_nak_daftar_qr_code_my_sejahtera.pdf
    • https://static.s123-cdn-static.com/uploads/4446377/normal_6008185d47fce.pdf
    • https://cdn-cms.f-static.net/uploads/4378425/normal_600ef8047bc75.pdf
    • https://cdn.sqhk.co/wuluzajiroz/jhmA9id/yeezy_350_v2_asriel.pdf
    • https://cdn.sqhk.co/sawitofi/24awjgp/dead_zed_2.pdf
    • https://static.s123-cdn-static.com/uploads/4527357/normal_6007b835b5b1f.pdf
    • https://cdn.sqhk.co/moviferu/6oLjhie/vr_games_steam_unlocked.pdf
    • https://cdn.sqhk.co/dibirolinu/shi0khf/here_i_go_again_drum_tab.pdf
    • https://cdn.sqhk.co/geruxibab/hdcijj9/prospective_student_tour_texas_a_m.pdf
    • https://cdn.sqhk.co/bezofusipow/Y6FgfaM/quick_and_easy_baking_recipes_without_eggs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_8a393e532a324172bd5dca288a1c557e.pdf?index=true
    • https://s3.amazonaws.com/lekizopiloref/present_tense_verbs_worksheets_for_2nd_grade.pdf
    • https://s3.amazonaws.com/gedexim/81365640829.pdf
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_9b6f852cb63b492e899e50596ff75f73.pdf?index=true
    • http://zugujegezamuto.epizy.com/editable_calendar_templates_free.pdf
    • https://s3.amazonaws.com/vaxebisapesi/cystic_fibrosis_treatment_guidelines_2017.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_93680be6314e4dbaa87c0eaf6e16c6d1.pdf?index=true
    • 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_off000126f6.bin
a1dc11cd4860b2d3a79b228f645324de0b96e520171eacf9247b5c49fc618757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 5208 bytes
font_01_sfnt_off000138e1.bin
5c911350ec5e301240c9582e33ac52ef788a8814a22f84401b18060d81e4a7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 11732 bytes

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