Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c52c816dc77948…

MALICIOUS

PDF

70.6 KB Created: 2021-09-19 19:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e72b8d81846db4da1a4f5d7e181bae5c SHA-1: bffc8e7d994a45d16fe7bbf26209f6bf8e2106d2 SHA-256: e9c52c816dc77948fcbf1328cda0d7e2029c8ba1ba2431f868afaa244d43625d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, suggests it's designed to redirect users to phishing sites or download further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=hunger+games+cast+glimmer
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/26422985394.pdf
    • https://reniuved.it/file/rupigijib.pdf
    • http://clearspace-design.com/CKEdit/upload/files/84826254852.pdf
    • http://jindi2010.com/uploadfile/files/55213152978.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386126a83c4---poludomegokapeju.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/xuwumumo.pdf
    • http://wadsoda.com/UserFiles/File/33659388066.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/pavatukomikusezowu.pdf
    • http://optikametuje.cz/userfiles/file/54672355412.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vupusepofe.pdf
    • https://funbugs.ie/files/file/zafusok.pdf
    • http://gaishachuukobuhin.com/js/upload/files/fibozedopawixi.pdf
    • http://sudeoksa.org/userfiles/file/20210908075816.pdf
    • http://laureysnv.be/uploads/files/xowovetiwawen.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/tunotadesozuverebaduzotu.pdf
    • https://cabsfromheathrow.com/userfiles/file/xabawinuwerekudagubusosit.pdf
    • http://villkasz.hu/editor_up/damapujomusowoxafosatat.pdf
    • https://accounting789.com/ThImg/file/gowafimexutuvapoxo.pdf
    • http://ntvietnga.com/upload/files/81315755081.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/gipapinavotaromi.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a29c65a263---596462593.pdf
    • http://poaglasses.com/uploads/files/202109090814294437.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/jobejukapawudinemilus.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_off0000b2bd.bin
8e57fd52fd2a39c23acf49ef197e939fd632d76e279326aa34978fb09cc5ce9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BD 10544 bytes
font_01_sfnt_off0000caac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 16792 bytes
font_02_sfnt_off0000e2be.bin
814f524dcabaa458578ee20fb47ec714280eb21364369e8adb0970b22661404e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16712 bytes

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