Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01fbd3f34acde87…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 00:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98ca17a43a2a4ca4e60a1fb40cdc222e SHA-1: 31f9f4911b7c68e85d1fb4bfa5b657e30235c52f SHA-256: f01fbd3f34acde87f9a7777e914a3f605d214783968d51d2688356555543dd31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. 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 0.9960

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://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/94140821592.pdf
    • https://sanaspinler.net/calisma2/files/uploads/36840685772.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3650cdf41---44624748058.pdf
    • http://bandbaajabarat.com/ci/userfiles/files/87937022040.pdf
    • http://marymo.ru/uploads/files/87975699402.pdf
    • http://vektor-bezpeki.com/userfiles/files/50670555671.pdf
    • http://a1climbing.com/userfiles/files/pununisibakunuve.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/24442385675.pdf
    • https://resicolor.com/upload/files/nakawosewezemevuvexe.pdf
    • https://triosms.com/userfiles/file/jonide.pdf
    • http://www.jobibon.com/admin/userfiles/file/zetamefofog.pdf
    • http://twtime.com/uploads/files/202109041632208805.pdf
    • https://patriciogaete.com/upload/file/gesasaza.pdf
    • https://digitaldaya.com/imagenes/file/4968571630.pdf
    • https://mehfermobilsaglik.com/userfiles/file/46840342279.pdf
    • http://nbmounts.com/userfiles/file/1630545277.pdf
    • http://diagnosticaedilizia.com/userfiles/files/mozunibajefaf.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/86933608553.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/kogiwo.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/fusipibomugigunidelu.pdf
    • http://extintoresorigen.com/images/editor/75851574438.pdf
    • http://jinanxintiandi.com/userfiles/files/fureluzonanakovojubi.pdf
    • http://highgaincomposites.com/img/file/2021952520.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=offer+letter+signed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7c.bin
e250a05fa9910b8b27b787f4bcc96767a09a69a0dbd540c9b3b7ebfef8162940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 17652 bytes
font_01_sfnt_off00010da0.bin
7a31079976ce6aa520301868518fdaf83c437a8acdc6d8300cc9c4485c3af2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 10272 bytes
font_02_sfnt_off000124ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 16792 bytes

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