Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8099e9e2bf8611…

MALICIOUS

PDF

76.8 KB Created: 2021-04-11 00:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b409a44f551c61673c864e6854ef77ba SHA-1: de9dc9ddadd93c415c02d2727af49c72539768ce SHA-256: 4e8099e9e2bf861131fa1337451cf11742ee7b962d913959f2340b7ba17c0de1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'zajinet.ru/strik', suggesting it's designed to redirect users to a potentially harmful site. The PDF's structure and the presence of many external links indicate it functions as a link farm, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

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://zajinet.ru/strik?utm_term=how+to+reset+asko+d1796+dishwasher PDF link annotation
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/1ef9cc79f557.pdfIn PDF document text
    • http://websecurer.tech/mortal_wallpapers_kombat_new_art_hd_wallpaperse9cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_601c86de4d9bf.pdfIn PDF document text
    • http://guitar.su/digital_design_subwoofer_18kmhk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_6061279ebe9e1.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/147baaf9293d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5ff33e0bb4509.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/hdC2pjj/solving_rational_equations_and_inequalities_worksheet_answers.pdfIn PDF document text
    • http://triple-doska6.club/math_worksheets_multiplication_and_division_of_decimalsg9gup.pdfIn PDF document text
    • https://vimijalubatek.weebly.com/uploads/1/3/4/7/134739875/2775430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5fe23344f24bb.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/bcD6R14/jumpstart_mtg_arena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ginokiximoz.rf.gd/80304158121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9249e2-14f7-46f2-a8b9-7ff649a0f676/instant_pot_6qt_duo_crisp_combo_pressure_cooker_air_fryer.pdfIn PDF document text
    • http://kodugexibitomo.rf.gd/zakurepora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3022a93-1846-4bdf-aca7-ab669e3be690/89080215203.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_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 5440 bytes
SHA-256: ceeff4eb9606e06f4759206cf5c02351c212336de9477fc8290138369b1f3dce
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 11448 bytes
SHA-256: 08f3e1a1ac50c56c40fa27f369344567f5305f952284138afefd0ae35eb89fe4

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