Malicious PDF — malware analysis report

Static analysis result for SHA-256 e938d864f0d99472…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 19:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98ce00ae5e34768d7a78de0288297b18 SHA-1: 3b1d8b8c0fa0f7824e30418eb944596f886addf9 SHA-256: e938d864f0d99472236f97adf2e01023f8dc7eb88784cb403f3f03b314ad9c2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_URI heuristic specifically points to a URL that appears to be a redirector with a UTM term, further indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=the+ranger%27s+apprentice+book+1+pdf PDF link annotation
    • http://we-women.de/default/files/uploads/file/74167238780.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/96098690786.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/73312034257.pdfIn PDF document text
    • http://inspeq.eu/public/files/98150964922.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b03da40c---22481162145.pdfIn PDF document text
    • https://majubesar.com/contents/files/ranijekodeduduvoj.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/zixipedidulo.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/kagupo.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/9083317110.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/55418059059.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/65511533985.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd956809c---51470709120.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/37891340108.pdfIn PDF document text
    • https://fultoys.com/userfiles/33758385328.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/papozikinuvodix.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210916074928.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/putedaxadubezad.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nowivunafiwesunibopofex.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/taluxuradube.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bovuzoforunapitadunitako.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/govagunumefudafuki.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/punalewefajedoxuwawe.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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 17408 bytes
SHA-256: 020fa821c42f73335049575a9471f492348b05ff54bf566ac0813e3bdcb62357
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 11132 bytes
SHA-256: 5c2022bfd32c6ed29fd989f4eb8514f6b5eed605426a961d0fc6b861f9134e5a
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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