Malicious PDF — malware analysis report

Static analysis result for SHA-256 00acadfe4bb92333…

MALICIOUS

PDF

77.6 KB Created: 2021-01-30 11:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 94a5a56053c08ba798e10437406d858f SHA-1: 279121132ae6ef344d590acc9c04f0445926fa8c SHA-256: 00acadfe4bb92333b7fee66b701622a25c94e03b1108980c2a62667747ffcfef
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to a vast collection of other PDF files, likely for SEO spam or to distribute further malware, rather than presenting readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/123?utm_term=code+talkers+book+review PDF link annotation
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/6e27453fa.pdfIn PDF document text
    • https://cdn.sqhk.co/dafazizaxav/23rfidG/hide_seek_movie.pdfIn PDF document text
    • http://gakebapenabe.iblogger.org/injustice_gods_among_us_unlimited_money_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/jdrsljh/8020405698.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/jbjioja/gurevaruzarofi.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/valiko-kugufemixazuj-vokexiri.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/mipabutibunib.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/hABRsv8/tatodofisi.pdfIn PDF document text
    • https://limulepaxot.weebly.com/uploads/1/3/1/3/131379958/gebawebagimesegelake.pdfIn PDF document text
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/9190658.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/oXhgmrh/assistir_filmes_online_gratis_furia_de_titas.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/tururifavusasufifev.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/jbZJ7Ot/guselawatamegukaxetibodat.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/gidifk8/konowofiburalavilabibaxom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuluputig.epizy.com/jacoco_report_gradle.pdfIn PDF document text
    • http://keximidurowu.rf.gd/padman_movie_online_free.pdfIn PDF document text
    • http://ziwefegilow.rf.gd/allah_avalente_pennakane_whatsapp_status_video.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/mekimazaxijofuzimurafo.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_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 5080 bytes
SHA-256: 2e1ee34676f027e0ab5004986f2404d8124761b6e71157ed2ad4bf6e81d768a6
font_01_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 11364 bytes
SHA-256: 71a22e04cd25d4bb1f2073c1dbafa4c47d96076ded5cc7418b0a8f11ff6fd44b

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