Malicious PDF — malware analysis report

Static analysis result for SHA-256 193f78666053fbe8…

MALICIOUS

PDF

67.8 KB Created: 2021-10-14 03:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 596361a34fd308a8e8403bc06c25f9a1 SHA-1: 0cebd95f1f95b1bd35140dc3b85da9e387b0c5ae SHA-256: 193f78666053fbe8bf1e46ff6fde8f2ef027daaad586733cdf1cbeb209db8e7b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The numerous links, many on disposable domains, further support the attack pattern of a link farm used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4355

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 https://cructi.ru/uplcv?utm_term=apple+bloom+and+spike PDF link annotation
    • https://chaletsuenodesol.de/files/18097646268.pdfIn PDF document text
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/38913415301.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/60413665260.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/pevedudurudipikapuda.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wulifujugakozupa.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/dalaleniguforejetukumu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/50533765936.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/83359115901.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/zogowotojajalaxikuzujuzer.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/75094337141.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/kusowegejekatibudeli.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wovibamezadin.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/kisiwuwuv.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/tupefilufasidifamekixutef.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/89135044329.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zovexinovuzugowerigesa.pdfIn PDF document text
    • http://sswjeans.com/files/58288992937.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996c95204b---30394970237.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jukotikokasa.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/20895917240.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/56286350649.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/10624763174.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/82058590264.pdfIn PDF document text
    • https://ruja.lv/uploaded/file/95227441065.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/lakuxelakazokuvegelume.pdfIn PDF document text
    • 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_off0000c27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 17636 bytes
SHA-256: 4202ee8c7b95c9a8eb4a6f2c6bd0e7440ea040bde429d6477fd20adb40b78a18

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