Malicious PDF — malware analysis report

Static analysis result for SHA-256 8996c4ed9c2442cf…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 13:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a01a346116b03771d593893f0af45f2 SHA-1: e94249b8a5a06047e6f321860c2bfffd2eae505e SHA-256: 8996c4ed9c2442cf53bc02ef67f7478414dbcd2fba1272551ef7829e20f7b63e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using numerous disposable domains to host malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=ios+telegram+for+android+apk PDF link annotation
    • http://duhochoangthanh.com/upload/files/48799933763.pdfIn PDF document text
    • https://biocoils.com/img/file/viditaforurabobuwomarizon.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/82611284344.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/milunuzeturozixigubaf.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xasavikikaru.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/24827756998.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/98992773392.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/87678990406.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/58349097839.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ccb757052802f4cfaba04c4a87ec58a8/ketedipoxipemarogovid.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/batidajonolorewovebun.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/kedudafut.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/woxodowowixuzatokepogi.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/60068804941.pdfIn PDF document text
    • http://airmon.hu/images/files/85977433671.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/55316666601.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/dofujizotetusote.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zitilikilaminukinugu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/morazarimatawizetu.pdfIn PDF document text
    • http://olympusflights.com/files/files/vigomuridasunobotamenete.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/28636950053.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/namokorepi.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/70447305035.pdfIn PDF document text
    • https://loctra.net/userfiles/file/95715303345.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/14907231067.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 18648 bytes
SHA-256: f53aa8dfb425c52baf861853ea372fc7da78285938230247b95f7d2de1d732fd

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