Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cca0a092bd7a78…

MALICIOUS

PDF

76.0 KB Created: 2021-09-26 11:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b651718ce1f37aa5b6debdd84805b0d8 SHA-1: 80ad503a1f9d751372852a27f8faf264e4c0713c SHA-256: a9cca0a092bd7a78d3b5ff8af1281e91fc1febc72d864aebc4e3e7fb6a39a4ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This 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 domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The authoring application 'wkhtmltopdf' is often used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=latest+android+version+name+2020
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/pemusijitesazixe.pdf
    • http://garankuccu.com/upload/fckimagesfile/5e43cebf7e80ea9d3004bcf7b565915a.pdf
    • https://wupaojichangjia.com/d/files/vemotukopelorine.pdf
    • http://www.gdchgs.com/admin/img/files/79546418212.pdf
    • https://limblength-sldf.com/userfiles/file/82934371925.pdf
    • http://immobilieninvestors.net/userfiles/file/86366823823.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-6/20210906015021864075.pdf
    • http://elijasprojekts.lv/files/file/83999326056.pdf
    • http://nationalcoopadvisors.com/userfiles/files/rozoburu.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/rusuwufimuxu.pdf
    • http://sinoscaform.com/upload/ckimg/files/202109060458529254.pdf
    • https://photojet.bg/userfiles/file/moberagotaliwemajixibijo.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbfc8bc22---mukije.pdf
    • http://akwarella.pl/user_uploads/file/27228116271.pdf
    • http://soles2walk.com/data/file/46089062402.pdf
    • https://ekoelprom.pl/public/images/editor/file/1020926600.pdf
    • http://marjoleintje.nl/include/userfiles/75670879160.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/46815535770.pdf
    • http://vizit-k.net/uploads/editor/files/95237629971.pdf
    • http://j1medical.com/uploaded/file/nebisusekiguwemu.pdf
    • http://ippinnudon.com/uploads/files/25557348725.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/53160937350.pdf
    • https://batdongsandothanh.vn/luutru/files/2913573583.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/newuvodisavulex.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/21358966931.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_off0000bf5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5F 16792 bytes
font_01_sfnt_off0000d776.bin
69f0422a46726ccbbea75d394741c9bcccb052d4d6068aab516db4172eaac639		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10628 bytes
font_02_sfnt_off0000efd6.bin
c02d5048019ebf7bb764596ebcf93ffe156ed84ec4207626a18847c55e324cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 19308 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.