Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc64bc3a4d080dac…

MALICIOUS

PDF

68.2 KB Created: 2021-02-19 13:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eb57976b3b391ec7cf0d31181da86b1d SHA-1: 9aaf251ea2a25c673fa83af071a2e0c8fbdbae86 SHA-256: dc64bc3a4d080dac655154495a451b6b8ad95f53ce409727b00487cf9450d184
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://maypoin.ru/123?utm_term=onan+generator+parts+dealers+near+me PDF link annotation
    • http://orbitan.fun/roduzokapokevilotigeeczkf.pdfIn PDF document text
    • https://fizutijerenom.weebly.com/uploads/1/3/5/3/135391470/72519dd6a.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/derasufujo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5ffab4276fa6b.pdfIn PDF document text
    • https://zedimidobigeno.weebly.com/uploads/1/3/4/7/134721933/pejanimatawobasur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_602db277ebe6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_6007c5f82e612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fd63e2dcf340.pdfIn PDF document text
    • https://xogovowumo.weebly.com/uploads/1/3/0/7/130738979/pomobub.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/muxenupufa-pababidixad.pdfIn PDF document text
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/4582c3bd0.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/1036835.pdfIn PDF document text
    • https://woxopipuwesubaj.weebly.com/uploads/1/3/1/4/131453061/duwizunejin_debufix_pawesexowifo.pdfIn PDF document text
    • https://metolokinazez.weebly.com/uploads/1/3/1/4/131452743/pojuzuru.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/90417bec58.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/waxapoz/kivelu.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 5308 bytes
SHA-256: bf755ad59ca15b7c34869bc685140fbc47085ca79327b665033c7c0116be6f18
font_01_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10968 bytes
SHA-256: dcc7c706025d75d20f90d7a3ad35634c3760c763e77d6e57d0d055dbbfcf64a0

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