Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3c716dd7528c27…

MALICIOUS

PDF

78.7 KB Created: 2021-09-24 08:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac5da68c00b2d39fe130bbf3748eb9a3 SHA-1: 86f7b2a2b6d7137489b1683d92af4eb585f71480 SHA-256: bf3c716dd7528c2750f5031d588fae48e4d7cf0118d7b770fd382b8b285a5430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=the+basic+laws+of+human+stupidity+free+pdf+download PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fc3562cdffcf73c5f153dfc92cb2d91e/peger.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/54346815291.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/pebajezo.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/36224284474.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/24693519135.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/14375598204.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/pumirame.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/winozeg.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/44873804512.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/fiziguvofajezo.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/9040587726.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/19974793383.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8372858217.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/99873197203.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/44325007026.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/51935519719.pdfIn PDF document text
    • https://mikludava.lt/images/files/lileje.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/35975202309.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lifozumategivusexepogagog.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ce806d01c531bab6fbb50b53f196c034/78001214684.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/72507539115.pdfIn PDF document text
    • https://masihpt2.com/contents/files/tupimajasibopiwibabud.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/zegesavuzogo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210903170121.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_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 11288 bytes
SHA-256: 3cf819c8cfcb7d042749f7c11af76983f0f84fd65b7c710e01cd4ba60a046d2b
font_01_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 17864 bytes
SHA-256: 8dc5a4c6bfaf5e19c234b286313e507a5e1793625274fb8d88ae492c35ec519a
font_02_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1