Malicious PDF — malware analysis report

Static analysis result for SHA-256 6956e907cf921685…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 17:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4932353c34f0f67c7303ef83116d9205 SHA-1: 96725e2e28913f6efe43774171bfd2cb78ca1642 SHA-256: 6956e907cf921685b30ed3e65da319a284b13ba01f89790bb70db4af7361d38f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

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://bologen.ru/123?utm_term=minn+kota+ultrex+80+52 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366957/normal_600fb48b8d0a4.pdfIn PDF document text
    • http://repair-foto.ru/54717615467ybxxz.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/madujozovar_xerupa_xeporusanod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_5fe93af0a2201.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/bujafol.pdfIn PDF document text
    • http://romeital.space/loluxowezattlj68.pdfIn PDF document text
    • http://hookup671.site/jack_and_the_beanstalk_story_imagesle1tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_6013a2df8d1ca.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/aaac007ed25ac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366956/normal_5fe30e3d7487e.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/27364358529.pdfIn PDF document text
    • http://falifipes.iblogger.org/teamviewer_9_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_5fd26d6d02fa2.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/wemubiwebupu-mutisusibu.pdfIn PDF document text
    • http://futegejetebe.22web.org/let_it_be_piano_sheet_tutorial.pdfIn PDF document text
    • http://bupetud.xyz/fupumapifek2n229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tonesovuxor.rf.gd/free_printable_christmas_wrapping_paper.pdfIn PDF document text
    • http://zoxarulal.rf.gd/kdigo_guidelines_steroid_resistant_nephrotic_syndrome.pdfIn PDF document text
    • http://jujeludapivibiw.rf.gd/waritulitugatikatiz.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_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 5228 bytes
SHA-256: 4f33f82b65d0d5ffb84f8b0616f672ef82181d6ae0a6dd051919121dba55d7d0
font_01_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 11252 bytes
SHA-256: dec786950533aeadec10ed54e7608f4b6d9e49dedf77234ebf1b3d898e10a12d

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