Malicious PDF — malware analysis report

Static analysis result for SHA-256 94afa4a606f60322…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 19:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c244971e31f41c01ff9e9fd9e46bfa9 SHA-1: fae71e7df3c59eefb0abbeb9851a1a55fc82d97d SHA-256: 94afa4a606f6032223afc1446209b1bdd7030fb6a58449e859b7fe5c20027fd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214e57ff61---56134062258.pdf In PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/21726736359.pdfIn PDF document text
    • http://seamacros.com/upload/file/botamix.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/pekub.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/sorekafadurubisabesivop.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/79583257191.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/gojatu.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/22361276965.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bofuxedimasukubet.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/22518561836.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/29875443977.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/77019396131.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/65549150172.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/62643754642.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/marexojokuruwalofimara.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/31405083752.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/viwulujabilawewimipusot.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/titedijegimon.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/leniwabafarovitixofogi.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nitofoleboxi.pdfIn PDF document text
    • http://headrepublic.pl/images/files/45676461205.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/gufik.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/leranifavowok.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diketa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+fix+corrupted+sd+card+in+androidPDF link annotation
    • 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_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10848 bytes
SHA-256: 24a70beace6ce3f1ef19a65022dc1b35c46ea3e944c2d532f70421218ea3738b
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 19460 bytes
SHA-256: ed6d221f4579b8077ca12961efc6fbeece38d76eae25f98d526e66c67fcd5f0f
font_02_sfnt_off00013ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1