Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ba38324a5c32f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-11 04:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a27498c5f24dce8be5f0929d8e6e02be SHA-1: aabc53cce4e9b125c6518b86a1f58328e3c7d76a SHA-256: 743ba38324a5c32f29a115c18bace33d054fe3b7e5c6f3aa1bafac56ac1c48ad
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://synerhu.ru/uplcv?utm_term=how+to+see+private+ig+profiles PDF link annotation
    • https://mamo-tato.ro/userfiles/file/44109660973.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613617cf87eaf---ziledaju.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/suterafikutokasiwikifar.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/43212145002.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091109165882.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/rodovixigixigusorovexoz.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/gafavuduvokelepiwikosaze.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/65371336666.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/dufidawiluper.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/kitela.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/66102172591.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/81431397683.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/95898290520.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/ruvoz.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/ladokotadexopepikeg.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/zoximagofanefe.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/16719928159.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/4323870743.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/sozatoruseporesamoguzoko.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135bda23ec46---34848604498.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/2163411622.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6D 15760 bytes
SHA-256: d0991037bf69c459fdd96d5d77186c2d15e561c5308285377accee93edfa7d73
font_01_sfnt_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 10572 bytes
SHA-256: 6dac7d65c359bfa79734c1708e05845298271da324841ce9ccc31553372917ed
font_02_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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