Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf15b271658cd202…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 06:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 156c4cf2f1c41dffbc88e4721a33b0be SHA-1: 35ac5f2044f1b85363b5ee118de72f44c32f52b4 SHA-256: bf15b271658cd202c937bf5b8801cbff4e6d64f3a283e70ec781c403d158f9d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is designed to host many links on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=gnarly+triangle+headphones+promo+code PDF link annotation
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/66030135039.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19d654b67---kamafadisafokaxatesim.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/71015031903.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/dusijutogewuw.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/rexuro.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/resuvogurejef.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/94752242080.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/19095929320.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/werajir.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/98529662240.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/32419252446.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/nukijoxitoxemifelovororab.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/noxideterogadusevuse.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/mogevopinef.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/89406002322.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/93878173924.pdfIn PDF document text
    • https://fratellifurloni.it/file/kenizun.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/50990254011.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/38487041084.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a02d1bfc764f6e9721c5baea9eb43bd7/73959490841.pdfIn PDF document text
    • http://cpviettin.com/upload/files/11662048087.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_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 18988 bytes
SHA-256: ad7f2144618d794cf3587e1e0dc6b6b67d06b0db8d37da372d17d4c614d78447
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 11112 bytes
SHA-256: 630991db9a607ecb45a7087a6667db4496889518fe671828644ce88febef7f3f

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