Malicious PDF — malware analysis report

Static analysis result for SHA-256 908262d0dc386370…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 23:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b142bd09e916f88d45fbad6b97748b2a SHA-1: 60c18a7bb4d594723d6b586c2a4fee1685aba235 SHA-256: 908262d0dc386370f35da600797fe1dcea357db0f779be17415dd42bfd66aa5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=application+android+pour+retoucher+des+photos
    • http://steelbo.com/uploads/admins/u0/files/20210911030905.pdf
    • http://asu78.ru/userfiles/file/72210228864.pdf
    • http://abw10thstreetne.com/uploads/files/jamekapexegog.pdf
    • http://hpworld.hu/data/pic/Image/file/85197868203.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/94708755305.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/1747960619.pdf
    • http://usmleworkout.com/files/file/bemudetudepolalatekukariw.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/tilorikopuwuzozuxitov.pdf
    • http://gtlitalia.com/userfiles/files/kemewos.pdf
    • http://interroadholland.nl/userfiles/file/megejofeletoxunaka.pdf
    • https://intersensor.ro/v2011/Files/fck_upload/file/mosekuro.pdf
    • http://lexxyin.net/files/fckeditor/file/32962751720.pdf
    • https://mobile-translator.eu/app/webroot/media/files/32833506953.pdf
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/81895027605.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/togodabozivejajexa.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc796b6a99---45414057118.pdf
    • https://amatnieks.com/pictures/image/48083300054.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/87688234314.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/zogoxiwupuga.pdf
    • https://xenang-mitsubishi.com/fckupload/file/10791679388.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/siwesozusamilavet.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b75efc5bcaae3fab47d1efa7266f30c5/62561048504.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99e.bin
5ea2888fac441e84c54957e2ba612386ebd274e89bca547eaecf6f3b812b1942		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 18176 bytes
font_01_sfnt_off0001193d.bin
71ce0d0ce2ee0d08efc2dced9d0ecae47797a102691f15e4572faf4747722223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 10692 bytes
font_02_sfnt_off000131c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131C4 16792 bytes

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