Malicious PDF — malware analysis report

Static analysis result for SHA-256 1165aac40c8f7555…

MALICIOUS

PDF

63.7 KB Created: 2021-10-08 22:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0e93f73a77934347ebb960d62f308dd SHA-1: 2477d3a5bd26a5eb7926c674335701654d31b82d SHA-256: 1165aac40c8f7555fc2c3f460a07c1cbc2de1ce60f9699468a13fb77c81bec6e
124 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the nature of the link farm and the ML detection suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7607

Heuristics 4

  • 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.
  • 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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/si6k24d9t3lma0sbhpc3co4s04/22787561260.pdf In PDF document text
    • http://studiophotosfashion.it/userfiles/files/lesazopet.pdfIn PDF document text
    • http://101balkon.ru/upload/files/xowidejex.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/15544937288.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/29036835921.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/wemogogif.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/denuvajavosixemije.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021918102589637.pdfIn PDF document text
    • https://ekransamara.ru/files/davugikuseserug.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/43588600736.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/kadigo.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/bodijojaxewunikejan.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/75492461736.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/ruwofezolifukexa.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/xenigegugerinezobol.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/mimeb.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/67436535020.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/poleresudivodigewererilug.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/27847765551.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572f9de616---numurekogoridepulapet.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/zavalunaponupepidu.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/42992009624.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109270341566625.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/medimategujiletijodekubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=alabama+license+replacement+onlinePDF link annotation
    • 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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 10656 bytes
SHA-256: 79521eda6eb19bc1f1259c901d48c114e7e547399cd4ae8274347bc1177cc6b3
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16608 bytes
SHA-256: 4398b1331b975708ec738bcbf0f4a278307270c0338a2e94aaebc600949f5565

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