Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5920e3d5cfa7d6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 15:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a6a81f6d63aa8c54dfabcdec1b66de2 SHA-1: abf20c3e34225820d791504013da16eed642e885 SHA-256: 6c5920e3d5cfa7d6fc2014bd6fac2d412691da646f79fccd5d7a82f38f49b48b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The 'Browser extension / update installation lure' heuristic strongly suggests a social-engineering attack aimed at tricking the user into downloading and executing further malicious content. No specific family is identifiable from the available evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://growyourmoney.in/userfiles/files/60019914848.pdf In PDF document text
    • http://preiss.at/upload_files/files/4044968209.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/36748231010.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e46a28f89---sibal.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/tasetizovipuwepadolabupo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/96951653119.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/62281494967.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/85149370780.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/19863119507.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/gijarekagevibesufupe.pdfIn PDF document text
    • https://ikima.fr/uploads/file/70776599597.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/towezatufifugixot.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/95205297221.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/14754155820.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/84980537749.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/jenudawuwegedibewabagorep.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426a80cdd66---fopezopirekodaf.pdfIn PDF document text
    • https://loyd.rs/images/file/48661059017.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/73997962151.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/43769932935.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/pazusubuxomuxozolam.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/63335501141.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/tegezagirukizomediti.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/tobod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=historique+google+chrome+androidPDF link annotation
    • 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 11052 bytes
SHA-256: e71045bb37f1f359998fa79a988da337f41a4bcf2730864549caebd270f69aa0
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 17300 bytes
SHA-256: d1c5068d04de48394c17ee6a749d52901e9f7055d52bf95fb1615106f2eeeeb4
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1