Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba38634bbf997a7…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 01:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 490abfe5c0ec60ae2f8a6bdde1f6a28a SHA-1: 2e959661e570ad1412130c476a667138d7806cde SHA-256: 6ba38634bbf997a7315f362756b8ba27509edea03c05dab75c6426e8134d6281
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, specifically for brand-impersonation credential phishing. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, appears to contain keywords related to setup guides, likely a lure to encourage interaction with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/zuletanukurezek_kelaroligotatid.pdf.
  • 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://soxebez.ru/strik?utm_term=how+to+setup+spectrum+remote+to+samsung+smart+tv PDF link annotation
    • http://rosolab.scienceontheweb.net/ccna_cisco_certified_network_associate_study_guide_5th_edition.pdfIn PDF document text
    • http://jirekakeduvinij.22web.org/bolukekifebose.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/zuletanukurezek_kelaroligotatid.pdfIn PDF document text
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/baxonozolarogag.pdfIn PDF document text
    • http://kuvobutigok.iblogger.org/easy_sight_words.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/masizorifu-mebozase-pobago-jemodojefizelaf.pdfIn PDF document text
    • http://godisibipuvam.22web.org/bigorelatufuse.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/LEigQhj/best_chess_puzzles_app_android.pdfIn PDF document text
    • http://fewutame.getenjoyment.net/aromatic_hydrocarbons_class_11.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/jgAgjgg/71800438728.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/john_dewey_theory_of_valuation.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/rijirizusomis-virevidivakivu-luvageriva-jelutaxosokido.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/jcjdghg/athenion_tactical_ccg_review.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/endogenous_growth_theory_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/ciaeINr/bizimixapakofagezureru.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/xojafemori/movanepepamelefanu.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/fovebijuruserofavokubo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/wisesepovenalumed.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/what_was_the_point_of_the_four_freedoms_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/16567274222.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_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 5332 bytes
SHA-256: 1e947e975a4fecee8d0310a6c379f55473b4131273d7e6c9bf94204c65a413d9
font_01_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 10376 bytes
SHA-256: 9d3e446e62a1a633400760df3d29f66e65adc9f6b147567fbc4841f308f31726