Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d1d696b8e71d75…

MALICIOUS

PDF

65.2 KB Created: 2021-09-20 00:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 45acb8ad19876bf3b83d4a60d0d4d06e SHA-1: 430635560973682c1d445692961a6c5ed4992f26 SHA-256: a2d1d696b8e71d7507f4d67824207f54683d828d5068afe6bf391d991c31935e
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 0.6279

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 2

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
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 16296 bytes
SHA-256: 38fd92c5ceaf89a7170bfce5bd070aef6df06b171a8e314a3755e8d65f6aa652

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