Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b1b64fbd22450e…

MALICIOUS

PDF

59.5 KB Created: 2021-09-22 20:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c001cb549fcf0fa60461cb8006504506 SHA-1: 713a67204d150a036b5aba422bec61fff210b49a SHA-256: 92b1b64fbd22450e81d135a06016270335fc28f7adec241f1a697a24f03e217d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm. The embedded JavaScript likely serves to obfuscate the malicious intent or to initiate further malicious actions, such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8143

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://pixomot.ru/uplcv?utm_term=log+out+telegram+iphone PDF link annotation
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/43904672681.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/26072016004.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/fozolinu.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/73337546136.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/61159834975.pdfIn PDF document text
    • https://negaratoto.com/contents/files/80227720308.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/63281730084.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/40836770534.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/siludojabir.pdfIn PDF document text
    • https://citronel.com/userfiles/files/41992670205.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/56044042772.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92440763107.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/85173710546.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210918_154151.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/39803106528.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/3612016330.pdfIn PDF document text
    • https://ottopianos.nl/files/15112501434.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210919144707.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/44256820190.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sesililopiwazebe.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5b944a0a---bezozu.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/kexakavajobinagapo.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/36616155213.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/voturidejuzikuw.pdfIn PDF document text
    • 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_off0000bf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF69 16856 bytes
SHA-256: 8cf72fe360dca76182b0cdd77885a0c2b538faaed4cbe95c4306531d646f22de

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