Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aea9e09ec8ef81…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 20:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32df5112631954edf10c9b8089454c50 SHA-1: 7b4086492cbe9f4c13caf61284cad88701b4bdd5 SHA-256: f9aea9e09ec8ef81c6987eb6b95c2f6c205f44ca9cb230ab7a60c316d900a322
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to host phishing pages or distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

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://philabc.ru/uplcv?utm_term=what+makes+potions+in+minecraft PDF link annotation
    • https://praktijk-fix.nl/userfiles/image/file/93146120708.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/denug.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/34689364361.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/84079849281.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/kexerowulavofo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420be1d23ff---48517430230.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/25438519757.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/wufapivegujexukodaxaba.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/zerevilareduxetifeboge.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/jojoviwoles.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090822574218997.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/56220013262.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/topujezusedadanu.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/86744172384.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/popuzo.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/19286553281.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/xuzulimop.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/vobavigumalidiso.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b541ef32b---7896599363.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/74107253504.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/wupegani.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/xutadalavozoga.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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 17552 bytes
SHA-256: 7877ca6bc90b776c19d92df9bc1d1215e5adf94e2a5b7d2c0a0691186d753068
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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