Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c5065df4e71967…

MALICIOUS

PDF

65.3 KB Created: 2021-09-26 23:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7f490cf453f8ec0c5866d9e46994764 SHA-1: cbefc0d35ac26edade8b596fb0f4cf467686c221 SHA-256: 13c5065df4e7196750edf3763ffe20f197a9d9973247e9107c87719fd446879f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of many external links implies an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4894

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=exercises+with+present+perfect+simple+and+present+perfect+continuous PDF link annotation
    • http://aqua4you.hu/userfiles/file/ximelurowefasewijebo.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/39400504093.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88520700723.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/karunojesa.pdfIn PDF document text
    • http://zenithmetals.com/files/tajibofiwikoxamanas.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/dajupisapivavufok.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1f3dd39f---monudipazozapatumek.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109170229389495.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/71794020697.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/3977026679.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/56438721796.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161486d4ac333c---zaxosuladegoxus.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wajes.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/1573563618.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/18125748535.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14062659791.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/vogufamejewis.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911150556630723.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/suwadosoneku.pdfIn PDF document text
    • https://ibericadearmerias.com/file/85245748841.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/42703356925.pdfIn PDF document text
    • https://insp.biz/img/file/zuzuzijalef.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF2 15216 bytes
SHA-256: 4d0cf9a2834ecd419d76e5a803a945a5b266d1d01b412d58bec49774734491ce
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 11156 bytes
SHA-256: a563da20b6ac9995bf79038eff2b71c46f543681430969c9410b502955a9f928
font_02_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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