Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7533c860e107c15…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 19:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd6e6a6497d7caeda33f2b95674d44f9 SHA-1: 62371b2d12310f648b8a3882680672013f027bc1 SHA-256: d7533c860e107c150b04e524c7182635ca97705ffca2e3a07a02e16d516156c9
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggest a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6997

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://garglob.ru/uplcv?utm_term=menschen+a2.1+arbeitsbuch+pdf+download+free PDF link annotation
    • http://smingames.com/ckfinder/files/76455741187.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37711469673.pdfIn PDF document text
    • https://istanajp2.com/contents/files/36097117923.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/63317404138.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/29122542033.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/lixugu.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/tesovanowimatafirus.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/66110658539.pdfIn PDF document text
    • https://ijp2.com/contents/files/78582695079.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/mepozivelugusutogiso.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/wadotalederijiri.pdfIn PDF document text
    • https://menu2uplus.com/images/file/614798406.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/jamatirazomukazozesisu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d02b43cb0---tanojaxaminoladozenopag.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/96384510292.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/81365164187.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/33329357520.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/48998919216.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/foranefipebowegu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/75492461736.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/37653581374.pdfIn PDF document text
    • https://labelmarket.eu/data/file/68783856366.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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 21392 bytes
SHA-256: 6cf5e1f84897892a571505d5a3bbd4769be6fd80d3160cb613a0501c8b43192c

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