Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db8ec338677c842…

MALICIOUS

PDF

74.9 KB Created: 2021-10-04 13:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7387cc6d08956364c67793d92e1ce72d SHA-1: 673518136c65b55b08e5268433f1728297a7eaae SHA-256: 5db8ec338677c842d8a00b1be622adbee18db3ff0f54f70db7e9b63f051c6ee5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged the file as malicious. The presence of external URIs and the overall structure suggest the PDF's primary purpose is to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

Heuristics 4

  • 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.
  • 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://chcial.ru/uplcv?utm_term=building+reliable+trading+systems+pdf PDF link annotation
    • http://goksirlambinowice.pl/img/upload/files/vonimi.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lukupokexusaluvex.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/45355188604.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/99672355579.pdfIn PDF document text
    • https://wecareprogram.org/images/file/vuzefeg.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/busilorodax.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/43887905131.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/99529025440.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/bizivuwogurofud.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210913102255.pdfIn PDF document text
    • http://119pump.net/d/files/99017942522.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/73114248484.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/68914402578.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecff75d406---ginafenorazuravadazaluf.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/72960114476.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/xitil.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/widijikiwigepu.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/83590434050.pdfIn PDF document text
    • http://tyextractor.com/d/files/89866506777.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wikomumin.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/fepiwekeginovupujukej.pdfIn PDF document text
    • 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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 19256 bytes
SHA-256: b416062e23e024ba7cf37d64f668ab8ac46e909b552b6b821fccb1727f01230d