Malicious PDF — malware analysis report

Static analysis result for SHA-256 779f9dae0292a801…

MALICIOUS

PDF

54.5 KB Created: 2021-09-20 00:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b33bdbbb2e944876a21a97765e5ee37a SHA-1: 417a6a9755e04c41c6804bba725cdbfb07577e6b SHA-256: 779f9dae0292a80114d8e869deebcb426406ac1e4ece12514c5ed15ce524beab
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, likely to further malicious sites. The embedded JavaScript likely redirects the user to one of the many external URLs found in the document, aiming to deliver a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

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://ibericadearmerias.com/file/getixalupanezepadul.pdf In PDF document text
    • http://naosgym.com/userfiles/files/renunetivapezebenotawo.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/62951388348.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/bututu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gozodot.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9440df12---39841269696.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kavutonafibokosuduxalez.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/fudivobexopepumegiwopage.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/7653931987.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/tejozenulawesovosukus.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/62389557778.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/59221549335.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/37120040899.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/dunalibaxomukesokase.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/61874732292.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/nipezinofirijujafugojevi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/golujozaketadipolivevepij.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d7qpjt5h90ofpnd231a3r5c9os/9311973820.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/jaruvudikabu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7594553535.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/40565617185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minions+wallpaper+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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