Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a9887e79f4edca…

MALICIOUS

PDF

73.7 KB Created: 2021-02-10 00:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 13d4bfccda6e3ff5d1ce96fada2f8ce8 SHA-1: 9c162e89d0ab43af90ff4f118a1ea7e4f8574344 SHA-256: 98a9887e79f4edcab81caae1d9174e15d7f5c4f89ce0f200d1aae48bcf26985e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or SEO manipulation tactic. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

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=sorcerer+points+explained PDF link annotation
    • http://gbarb.me/7640082406h6wgo.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/0t0QL2h/youtube_music_eagles_best_of_my_love.pdfIn PDF document text
    • http://zoosalon.org/best_knife_sharpener_amazonqu5as.pdfIn PDF document text
    • http://freshka.fun/ab_initio_etl_booksgel92.pdfIn PDF document text
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/xadomidofadireg-sutaweposime-jegofokol-wiwipiwivif.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/739195.pdfIn PDF document text
    • http://fatiberekizibu.iblogger.org/36592350207.pdfIn PDF document text
    • http://klokisik.space/britax_frontier_manual98d41.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/ojbwkhe/xezevurazudenuwopomos.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/Sjfijje/youtube_vr_app_apk_download.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/jarawaxanivu/radical_candor_executive_summary.pdfIn PDF document text
    • http://zonadomafi.rf.gd/chromium_internet_browser.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/flexco_rubber_sheet_flooring.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/61125949658.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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 5240 bytes
SHA-256: c0750b99089fa321762f060147c6625e4c4e9d7c573b0e719281bfb01345ac09
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 10220 bytes
SHA-256: 0212bce42cc3633dc62a925ed86284c88e602d84a25716b6a9c546529126cb5f

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