Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2358e6e3669262…

MALICIOUS

PDF

62.4 KB Created: 2021-10-05 15:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b91509599357beb168e6b35e134da35 SHA-1: 6704c40fb617d827d557384989692f88f1573d65 SHA-256: fc2358e6e3669262d6c641608a91136a485d92a89859d5ee99aa6e848ed307a7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features numerous external links, with one identified as a potential link farm, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5233

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kingsauto-bar.com/js/upload/files/juzota.pdf In PDF document text
    • https://miet.hu/kepek/bosufurobazi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xapaviforokigoluvov.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/56611377919.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/vewadoxi.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/tezupot.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/63884303429.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/xabaliz.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/62304934625.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/devexedenada.pdfIn PDF document text
    • http://exim5.hu/_user/file/34773430919.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/70757431203.pdfIn PDF document text
    • https://reha.bg/content/upload/file/56423754593.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/19757112151.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/pufoxulu.pdfIn PDF document text
    • https://upaspor.com/resimler/files/xufeganoboneb.pdfIn PDF document text
    • http://come2menorca.com/images/file/gugopexezagufutujiw.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614536514ca41---tefanabamuvas.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/86209470641.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/35929697016.pdfIn PDF document text
    • http://gerocuki.hu/user/file/76507242512.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/9824880493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=strong+granny+robloxPDF link annotation
    • 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_off0000b487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB487 16032 bytes
SHA-256: 311de15f8396d49fc7e62031cb3e77f7f7818373f6dc3895d3321c2e5a9cb72e
font_01_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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