Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b881e774fcc670b…

MALICIOUS

PDF

75.5 KB Created: 2021-05-04 10:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b3e269ec1194643e96de92d3cc6d92ba SHA-1: a04407e70df85466f8994c7eb4de7809a1563177 SHA-256: 7b881e774fcc670b2bfc4f4351d27562f524c8a385c8bb5a3afcb595ada369f6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by directing users to external, potentially malicious, sites.

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://midufefew.ru/strik?utm_term=what+is+the+weirdest+name PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411937/normal_606d57159f5a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_6003a7ed0f832.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxitiwawi/Bfjj7Qp/19599959669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcdcb37eeb93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_6058e487a9e6e.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/vafomekufiro.pdfIn PDF document text
    • http://epaytds.xyz/14367485083eawxl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5ff9af86a553f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_60637eadd0bc0.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/h0Z51ia/kung_fu_panda_2_netflix_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_60118916080e9.pdfIn PDF document text
    • http://firstflirts.site/what_is_the_best_embroidery_machine_for_home_use5t4xi.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/jbhghjd/29655921787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusebirenox.myartsonline.com/pomawilo.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/pinoredikufuwariberug.pdfIn PDF document text
    • http://navebulaj.epizy.com/51054250227.pdfIn PDF document text
    • http://gagarereforer.epizy.com/free_bible_concordance_download_for_pc.pdfIn PDF document text
    • http://vilipenizubawub.rf.gd/autoformation_webdev_20.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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 5136 bytes
SHA-256: f03e7c44c16e98e6fef35a360de203231037b533f7105e1784b15e5958d930b3
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 10556 bytes
SHA-256: 7971e8eabdeb98793eef110ccc4df06521b8c43d65359a03df3793916f125729

Open this report in the interactive analyzer, or submit your own file for analysis.