Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fa0100cabfd0e7…

MALICIOUS

PDF

74.9 KB Created: 2021-09-24 08:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 874be4c0016c38379b2f5f532dfd6a3c SHA-1: b94eb0383628bacee3c429181a84b1d9fea1e157 SHA-256: 38fa0100cabfd0e7058f56ea193b4a153f677a3ff3e23d9b888b69fafca78af5
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are structured as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8785

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://ubestsports.com/imager/files/20210901050539.pdf In PDF document text
    • https://tempatpasang.com/contents/files/24164590540.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614af727e90e0---juwotojatujivipixene.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/rokaxekuropoduvatijunaje.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/28382878652.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/10131595416.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/97635211372.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/64894900860.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/35171826578.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/resenigelekidad.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/60769920950.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/csoujb5fkrp5tnnldsuk00mb3c/82983349814.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130277c4a88a---lopowemire.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60554296553.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/fopal.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jojaselukilekonevawaf.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/85152294043.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109220209236638.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/9924149695.pdfIn PDF document text
    • http://calisnt.com/uploads/files/69777025636.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/duziximinuxife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=expo+notifications+iosPDF 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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10280 bytes
SHA-256: 0cc00733d8c0ece0fd03ab2fedcb46a0e0bd032dac9ad6775543cb71e5306dd6

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