Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae7cbbfddec6d70…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 09:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 91c7c702875fb6b76f191cfdb74d1eef SHA-1: 6b0df54b66af22ad2c677762c5f71c2ef82837bb SHA-256: cae7cbbfddec6d70e77b887afc65ee4fa43150c240b4a6cefd96cbca34e3d82e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially disposable hosting. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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://dakdekkersindex.nl/images/uploads/25850408851.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/31130479533.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/66378982504.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bafalew.pdfIn PDF document text
    • http://waypl.pl/upload/File/vamezerinipol.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/16284425410.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210908_8557DE30B327CF07.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/limowaruwanoku.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/lusakolodamurisoke.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/kiseripep.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nenipoximogowoto.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/56168213381.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/91459319342.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/53984271046.pdfIn PDF document text
    • http://arablift.net/userfiles/file/munugakilodorulewodesetu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nonisuwokitofizi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mawenigi.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/51890324453.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/kurasitatabexufiref.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/gazanoxikomirinevegamame.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/murofonotakirapojikerete.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/47906639412.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/27646299001.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/bejuvujawatav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+phone+ringtonePDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/temadumariwijol.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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 16684 bytes
SHA-256: 9e68ff216438d88206c75b63289cd0dfa47cf8e2fa1a12a36f925018f8b2f49f
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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