Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d9894c1bb5efbf…

MALICIOUS

PDF

62.3 KB Created: 2021-09-15 22:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0521a300d0cdbb1b5c1c2c88475418d4 SHA-1: 2b7c2e3426ee1573803b10adc6a2fd6dac8e6f37 SHA-256: 90d9894c1bb5efbf716e8676053915fbc930b43b9af5a5c154daf87b585f96ba
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8127

Heuristics 4

  • 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.
  • 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://cdmatik.com/uploads/file/joxepusejomabevonakuf.pdf In PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/mokipenupadugisurud.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/47434380103.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/5574486634.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913195735200.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/mizar.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/47266843783.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mofabuka.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fekupajuvigurudidodojab.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/sazofimowa.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/98105890454.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/41733896835.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/11638221763.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9563df14f---57632505751.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/35629154013.pdfIn PDF document text
    • http://nensi.si/upload/file/88871849740.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/60817886052.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/bijegobitipegujuso.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/av688jhl1dadg2b7ff89us3s64/vesagetesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=places+to+watch+anime+onlinePDF link annotation
    • 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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1