Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a24fe6fcaf6604…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 06:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ff311c4f8a42676916ced456017a489 SHA-1: d37e0f01dff2f64f41b892ba7d44906166955243 SHA-256: f6a24fe6fcaf660463aaa55913c705a7b5007771eeeb59e8c70d56efac4c23a3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to obscure the true destination, and the ML classifier and ClamAV detection confirm malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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
  • 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 http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kusafevanudevowizav.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/47504888877.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/bobegebogagaxepawig.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/61360826314.pdf
    • http://drsuthichai.com/userfiles/files/85775396637.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/85244412935.pdf
    • http://youngdongtec.com/userfiles/file/44001956150.pdf
    • http://nenayu.com/filespath/files/20210907044233.pdf
    • http://corising.info/sa_upload/userfiles/file/20210902113417.pdf
    • http://cameranichietsu.com/luutru/files/ladewikasufoxuzefebigi.pdf
    • http://cleanking.net/userData/board/file/16358818434.pdf
    • http://satcomlink.com/userData/board/file/porimefefaf.pdf
    • http://veterinariomauracotti.it/userfiles/files/paxunofuvetokimoketamawon.pdf
    • http://allgeology.ru/ckfinder/userfiles/files/39257824148.pdf
    • http://sentralperdana.com/file/saradipilugijasegud.pdf
    • http://chuanghuilaw.com/filespath/files/20210901135811.pdf
    • http://dezmaster.com/userfiles/file/11431025112.pdf
    • http://encino.kopanramen.com/uploads/files/68055551729.pdf
    • http://reelproductionshd.com/userfiles/file/sufasowo.pdf
    • http://casaperugia.fr/userfiles/file/40670361316.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=my+hero+academia+film+2
    • 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_off0000e1a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 16792 bytes
font_01_sfnt_off0000f9bd.bin
d9db02b3fb58a7d89d5d8261115bf0c667ac95301db9f1425202ea26f2bda33b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10600 bytes
font_02_sfnt_off000111f9.bin
78ff1f7166c64d55f79b28e078e7b7f2dab11541d42773ace84dff6e65238bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 21624 bytes

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