Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a51310e0dc378f…

MALICIOUS

PDF

52.6 KB Created: 2021-09-27 00:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21d339400b6ce745b633484a70c6e2cf SHA-1: d84ae71a621367127eaa0f775889be132c789e29 SHA-256: 44a51310e0dc378f62fada83d7923e15c1223bc4b6a5f0bc0ee2555e1f1ba4cb
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate this PDF is a link farm on disposable hosting and has been flagged by an ML classifier as malicious. ClamAV also detected it as a phishing trojan. The presence of many external links suggests a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8497

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://cructi.ru/uplcv?utm_term=play+store+banned+games PDF link annotation
    • http://rem-stroymont.ru/img/file/safazakogemusikexupawalo.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/3162968594.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xikefoputelevu.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/wopipenowapatusame.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/76569310136.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/47706533045.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/doxudiwapavenilisori.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/ligolomineka.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/69532506396.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/romod.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614199a9a29fb---zozokafop.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/13975621671.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/86890056412.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/jaboronowanabofu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/poxotirejokovivivoze.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/20694821436.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/dogefineweju.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/kixipivanuwidifirot.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/jigasasasokogaxusovuxibif.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/jolutivenuk.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/67136660166.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210925154730.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/relusedazin.pdfIn PDF document text
    • https://luminex.pl/upload/file/66321607183.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_off0000afd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD6 10756 bytes
SHA-256: 34ecb445d2c3342c9e38b1fc835c8e4a615835dc7cf15daa484bedfcf22be766

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