Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f7f1c61945ac66…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 10:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a08a59c3c66f72ff5330a902c0939e1e SHA-1: 643d02668e2fcbfb5daa748011f92a9439c1c1d0 SHA-256: 73f7f1c61945ac665c6a2d5770f706fa8c04fd333b66630cb2d3df68443daaa7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination or host a large number of potentially malicious files. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to deliver a phishing payload or malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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.
  • 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 https://leise.ru/admin/ckfinder/userfiles/files/16072941588.pdf In PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/pesokezu.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/fitilijaveguduf.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/zuwawe.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/liwamisavemibibap.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/razaporixenemebo.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/23339055745.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/xuzikuxabutekiwejedeferix.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/43225529317.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/49263883946.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381e146ceff---nagexoduro.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/gigifefakiwofupe.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/tikadob.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/75672918416.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/renijinizemepixuposuwuke.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/72021061342.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/31852956813.pdfIn PDF document text
    • https://kimcert.org/E/file/22712864628.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/74465079313.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/37817524344.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/ludada.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/38483049474.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/tawekoliza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=prime+os+downloadPDF 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_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 10400 bytes
SHA-256: 49f760aaa5f2e4e3339edcf087930e25d75fb90ee006cbf4c136826d508c8e0e
font_01_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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