Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cd64d3159b32fc…

MALICIOUS

PDF

69.9 KB Created: 2021-02-21 01:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 75f1d7e64b0fd2ab3c0af8026ee4544b SHA-1: 5c03e8e5ce6da9a485e254bc17bc1aec0de60233 SHA-256: d1cd64d3159b32fc93cf2b9c0bb46aaa7f002ccb77d9209003a20841c3834db8
186 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 0.9998

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/strik?utm_term=titulos+de+credito+escuti+ignacio PDF link annotation
    • http://itravelgr.com/79715028296v9poc.pdfIn PDF document text
    • http://detonicufficiale.website/latest_football_transfer_news_bleacher_report2jum1.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/UjYBKao/car_x_racing_2_mod_apk.pdfIn PDF document text
    • http://osummer.space/938648889002q0dr.pdfIn PDF document text
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/wusopedafabo-velivofelul.pdfIn PDF document text
    • https://cdn.sqhk.co/zisiribamen/gIUgxgh/nekiwivedodasifi.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/MggzhcU/classic_arcade_space_shooter.pdfIn PDF document text
    • https://merokiniperoj.weebly.com/uploads/1/3/4/6/134691049/dowiwesosari-mepazefudujet.pdfIn PDF document text
    • http://rating-bookmaker.ru/43083280770nlj5g.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/jiihqje/61140824041.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/hFhhdDe/nirigajixi.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jhWiiij/79401183750.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/1628641.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/AhfwgjR/mindshare_chicago_clients.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/lhhxjiQ/wemudikilaxojijo.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/nitajosasa/5362555206.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/81308086073.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/44132708346.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/kitchen_design_plans_template.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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 5056 bytes
SHA-256: e7ae8d50ece44c391fa181d5cc90789b4da07db2cd81df51689faca6a1288b7e
font_01_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 12004 bytes
SHA-256: befb3cedf4bf1a25cc21c1427cb4cc2d6c35378b7e9c8cc226c180efa5124813

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