Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8000cea4ae421e1…

MALICIOUS

PDF

95.7 KB Created: 2021-09-09 09:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a279f663d24117794d8b411baf4086d SHA-1: ad6c2fe2d7729e884ac10b9cc9ea2249e5fffdd9 SHA-256: f8000cea4ae421e13d1a17e8fb8cf89de42dbf4513433792aa9fa8a721dde0dd
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF acts as a link farm, directing users to multiple external PDF files hosted on disposable domains. This suggests a phishing or malware distribution campaign, with the JavaScript likely initiating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6999

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://russia-ex.com/images/blog/file/68027861821.pdf In PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/wuwuzoke.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/90316822542.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/18978722.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/nawizi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51804283115.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/35090687294.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zikawoniwavuwo.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/fopanogiworil.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/lemizonak.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/imvq5qr7nchhciedaakurkn79e/zugagur.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/natozilopid.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161306ff082190---28007663168.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tiruwo.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/13774773064.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/senetujarakutamowimip.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210904/2109041531095462350iyh16w3fl8s.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/sodude.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/85792683018.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/8e4d98e7e7fa4a725b0ad37fdbd74f25/5084654398.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/16394853484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=y+technology+wordsPDF link annotation