Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d848cc7884a29eb…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 13:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ddd7be5f126599342ec9c1fe220e070e SHA-1: ff4a5293d2e219791a7127ab19b39b571d95785f SHA-256: 3d848cc7884a29eb5850bb566eeeb2d30532ff2cdb3debdb54e896642adaef02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=network+theory+question+bank+pdf PDF link annotation
    • http://dreamwith.gni.kr/ckupload/files/zitojuk.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615804194d532---67791968870.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/40332984745.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/sezizoj.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/ninenipekipurifig.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xelepaxutifubi.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/56515768200.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/19662464895.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/desodudokib.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/99188367713.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/pajivizawotuvarekebazun.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/sanasun.pdfIn PDF document text
    • http://pronobile.de/catalog/file/21844958568.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/38382653144.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jexesebaloxofawipozedakib.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/50959878444.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/vajuluvupe.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/jesofopegogininom.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/84458780125.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/49100855970.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/3958043012.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/91330950685.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/lizakat.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_off0000add5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD5 15264 bytes
SHA-256: 2a938bff367405816d54c44b50a12806e85dff0d1fc8a7273273a1d838f3a6c8
font_01_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 11204 bytes
SHA-256: 69acb652bc429fcadf69022a06570f5f78e2acf95541e92cb5c0105590a35624
font_02_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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