Malicious PDF — malware analysis report

Static analysis result for SHA-256 99620b8ff210bea2…

MALICIOUS

PDF

71.8 KB Created: 2021-03-24 01:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 96999f73c2150c4a328793be4ebcebb2 SHA-1: ed054cdb1f3ed9326e4e8b7aa3bf53b8413dde9a SHA-256: 99620b8ff210bea2f012bc0137e63035a43ad52d9305194b417bf44c1454d514
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/123?utm_term=buildcraft+apk+free PDF link annotation
    • http://pornbustyvids.com/vewafadam32our.pdfIn PDF document text
    • https://riligisivimi.weebly.com/uploads/1/3/5/9/135992895/wejumesimop.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/4703888.pdfIn PDF document text
    • http://mabay.fun/lilivixiwexejibujuf5uhud.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/1gddeqJ/kingdom_defence_epic_heroes_war_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/ge4kzIk/last_shelter_survival_doomsday_specialty.pdfIn PDF document text
    • https://zebesamixigibo.weebly.com/uploads/1/3/4/7/134725806/busuberefitatupu.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/jivego_puzitetozunibuj_fafig_waxakidumojapim.pdfIn PDF document text
    • https://bobelijanufav.weebly.com/uploads/1/3/5/9/135960041/nesegupobalom.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/fuwawibu/akeley_wood_senior_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/django_template_inheritance.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/dubikus.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/3ds_games_you_can_play.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/punching_shear_formula_for_footing.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 5084 bytes
SHA-256: 3bad298effeb271d4c1460003b98b0d8f65f114ac7cbac3003bf045201324bc1
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 11212 bytes
SHA-256: bb399131d4594da067d9ee41a0e730e0eb39831baaee83e8982dbb1fe6756911

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