Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6464b129548c9f6…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 10:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 729066865d78055132434c2e086370ae SHA-1: f5f0777637943f1019eb2b92c0d0d66cb1162464 SHA-256: a6464b129548c9f6fb7ae369fb86e91c58941a90a1699f2c988a80e6195103a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and the presence of JavaScript point towards an attack pattern involving user interaction to navigate to these external resources, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=step+up+movies+streaming
    • http://budgettranslation.hu/sites/default/files/file/13155463756.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7a36abbad33d526e2169849fa80177f8/91479019543.pdf
    • https://cnc-ar.ro/files/file/3803836419.pdf
    • http://abwgulfport.com/uploads/files/fetuzoti.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/xolazodexavigofisabep.pdf
    • http://curry-box-deluxe.de/userfiles/file/jifivasoj.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6d9a1a5a---85360956744.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/timewixazi.pdf
    • http://plechotice.sk/tmp/file/3062747006.pdf
    • https://successstudio.net/userfiles/file/safaloti.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/87291235340.pdf
    • http://www.ferm-matic.fr/upload/file/34054154667.pdf
    • http://bjavc.com/filespath/files/20210905122437.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/paxiwij.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/88333155241.pdf
    • http://azizavacanze.com/userfiles/files/73900053080.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/48680747357.pdf
    • http://byecook.com/ckupload/files/94609366898.pdf
    • http://logistra.fr/ressource/site-image/files/papitataxumofukujo.pdf
    • https://100tmt.com/uploadimage/files/20210917181247.pdf
    • http://regalmotors-jp.com/js/upload/files/97253897269.pdf
    • http://clingac.es/d/files/xotugelubaxosem.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/sakivoruv.pdf
    • http://sissonne.hu/editor_up/12313076481.pdf
    • https://eetravel.net/file/25416155896.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_off0000f017.bin
94624fc94582d216f06bbc15a95fd50a682f65dfc483f1782f801562c83a3c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10792 bytes
font_01_sfnt_off000108f5.bin
4fa1a0893ae7e1d2c151a691a4c9075e3677b36c6496d0d09a9afa9f3175c649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 18196 bytes
font_02_sfnt_off00013812.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 16792 bytes

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