Malicious PDF — malware analysis report

Static analysis result for SHA-256 605d3fb530c9c867…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 11:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b02d577bf05f0547a5ddc58a9dac9f8e SHA-1: 956107e83432bf24c13701169b0a3f7f11a43987 SHA-256: 605d3fb530c9c8676eaea1d0e1147faa6498d491220a9f7ffbd6fe2646d291c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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 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://irlanc.ru/uplcv?utm_term=bruce+willis+die+hard+cast PDF link annotation
    • http://jor-agric-aqua.com/user_img/files/wumen.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/28309419112.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/57560988384.pdfIn PDF document text
    • http://creationart.hu/files/file/94313945994.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sobigokasogitidevavopi.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/62931193748.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/52016046869.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/ziveragam.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/86817237727.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/48911742903.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/fesumaxubir.pdfIn PDF document text
    • https://limsurdua.com/contents/files/38899653660.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/nazemufewozodutu.pdfIn PDF document text
    • http://akademibt.com/resimler/files/76368278466.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/guzemenagazapeguwajug.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/63621754642.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/gemira.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/2135536834.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/66583778412.pdfIn PDF document text
    • https://senfina.top/uploads/files/kewuburun.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/61874540694.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/webadivararas.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 10480 bytes
SHA-256: 4085f1fa3d1cdc285d31b0454bd66bb60d58f8c6da3ff56221aa763bead0d2a7
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 18080 bytes
SHA-256: 3ceb5fde7dd7ff854f475cd3fff122bf810a029ef53b00dcf125bf21f776cc56
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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