Malicious PDF — malware analysis report

Static analysis result for SHA-256 916fe332f44e339e…

MALICIOUS

PDF

76.2 KB Created: 2021-04-11 10:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 82312e6c98a6835c5dce85ea1a41fc8b SHA-1: 8d728cf4fc9ba58a2b94a4dfd65dacc88c76c591 SHA-256: 916fe332f44e339e536cd48bd2b99ebaf514d8b4dd8dde398c876f327aacb466
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF's nature points towards a malicious document designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=does+ufc+2+have+career+mode PDF link annotation
    • http://lapiwudoxavov.scienceontheweb.net/cedaw_agreement.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/KujgjdT/hack_swamp_attack_ios_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/Q1tGFgc/pocket_frogs_2020_sets.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/zibiwukavaw.pdfIn PDF document text
    • http://noxogejukebe.mypressonline.com/75331676952.pdfIn PDF document text
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/e62cee.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/arnica_montana_6ch_bula.pdfIn PDF document text
    • https://cdn.sqhk.co/pudinivil/nc3Jjek/xuzoxisilepup.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/12149769695.pdfIn PDF document text
    • https://muruvusi.weebly.com/uploads/1/3/4/5/134598427/welifamufatexiz-pigavu-rudamuk.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hegcddA/87653318199.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/fhiheie/gangster_crime_game_download_uptodown.pdfIn PDF document text
    • http://podjem2.club/zugenepoq94z.pdfIn PDF document text
    • http://citrus-fruit.space/i_inch_binder_spine_templatesbs3vh.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/zalisujezajaje/78236302204.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/38798946517.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/78181195953.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/gubuditunugibikufexe.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/zesukafububenubido.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/84469117716.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_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 5420 bytes
SHA-256: f51ef79538001849006deedc38042de700c8555b396462dc7d71f8623aa81b51
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10500 bytes
SHA-256: 0ca31694804f66b9931f757b258cba66d0b40365d052e2694e846d8af783f9d7

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