Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cc4ebd2032e4a9…

MALICIOUS

PDF

81.9 KB Created: 2021-02-04 23:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9d673225d84119174562483ec4401f3 SHA-1: 41426f238411924fb8c0deba861f63be17fc6c95 SHA-256: a4cc4ebd2032e4a9bd8abdcd083a0935584ceacb034bfd434a5c65b4eb4d2fac
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://druttle.ru/wb?keyword=java%20tutorial%20tutorials%20point%20pdf PDF link annotation
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/9dce5e4cc3.pdfIn PDF document text
    • https://cdn.sqhk.co/kanereneb/hancOhi/healthy_fruit_pop_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/2jjCwsk/bc_hockey_zone_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/d4sdhci/stickman_and_gun_4_mod_apk.pdfIn PDF document text
    • https://tobemokopa.weebly.com/uploads/1/3/0/7/130776516/68c7fa7e.pdfIn PDF document text
    • http://copyrightshelpscenters.com/821360640993stxs.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/Beix1gf/foromanozonidupilela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fe45085aaf30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420748/normal_60032fca0153c.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/32b41a81.pdfIn PDF document text
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/donadatalanarivudo.pdfIn PDF document text
    • http://tersq.fun/94201309497dmpie.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/sitok/bootstrap_premium_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/24110359372.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/queen_ay_oh_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/cheema_cheema_naa_song.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/66914718009.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_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 5084 bytes
SHA-256: 306b0ecafc500181197417fa025f116e02c743affc2c26235d6818bf2eba3008
font_01_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 11736 bytes
SHA-256: bfb654fe165d36da89098b2aeff1b1e8d1fa9292bf764b43375156fd370d6a3d

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