Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca81471225606d7…

MALICIOUS

PDF

67.6 KB Created: 2021-09-19 19:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35061fa559523e152d21c6a248caaebd SHA-1: 2df43a96cfdb1b071ab1eacbac1b0f773c8914dc SHA-256: 9ca81471225606d7d7f0741458f1d369b05ce90d21397318a593a112549ec52f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external links, many pointing to potentially disposable domains, indicates a link farm or phishing attempt. The embedded JavaScript is likely intended to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9192

Heuristics 5

  • 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
  • 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 http://allnatureint.com/userfiles/file/vabikajazadomoduwames.pdf In PDF document text
    • http://sergeybazarov.ru/file/wulaxikowoxa.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/gubalofe.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/65518537424.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/90100173039.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/52795091409.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/49873678923.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/zanazigowomu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/xogigikoga.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/zumalu.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/49874376651.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/73549491665.pdfIn PDF document text
    • http://contua.org/userfiles/file/43609059182.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/nivonilodakaraxojezume.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/95393754335.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/wizelolozi.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/famarakasoxafimuf.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/89725250650.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1e4abc521---89451652562.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9e08311aad8cf65491a5a262e586afba/mivopexonakupibobup.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/xamuxifowutexelis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=video+for+wallpaper+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 10280 bytes
SHA-256: 64951c51cb6f02bc89839d894cde6f8acdbc5870fb0381c44ae02046b681c684

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