Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cf7282dea71b48…

MALICIOUS

PDF

71.4 KB Created: 2021-02-12 06:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 94cc00165d1ccfdfc48284fed67e67d2 SHA-1: 052df12dfa3a15bca3148ecb592fb6a136bfd3c5 SHA-256: e4cf7282dea71b487fc650259356698195a3ac52215279099a2141dc50149299
184 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=redox+half+reactions+and+reactions+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_5fd85cf438de3.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/1SjaJia/statement_balance_vs_minimum_amount_due.pdfIn PDF document text
    • http://xevanaz.iblogger.org/61187371464.pdfIn PDF document text
    • http://weinmvc.net/warframe_solo_interceptionav939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5fdeb317b3f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_600a0308ab2a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_600c9852cda43.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/uiexFhf/rotator_cuff_muscles_include.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/Yrghji1/bimepumeresopefaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479445/normal_5ff4d0bdec233.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/c30BCMJ/female_mannequin_torso_dress_form.pdfIn PDF document text
    • http://wspring.space/muvozamovuleforoa5j1r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5ff808ee2176b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekurenu.rf.gd/73645879079.pdfIn PDF document text
    • http://tijejawoporufil.epizy.com/avast_free_one_year_trial.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 5340 bytes
SHA-256: 39baa89dfa840200e788ad28ee3ab345dd632ee52c8724322c3224cfa329abe3
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10428 bytes
SHA-256: 233f4ffd3507be1c9610f774262ab6bc55982089b209a01cd06937c4afcd3a12