Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ff4bb9c3706275…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 04:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7546decd943e91918c9efbfa298bb3c0 SHA-1: 1cedbb7920a84580b381223400f71bffdf30db0e SHA-256: 00ff4bb9c3706275ed6e23b0d8247c21bdd4ad2e1059420c61c1a338cd3ffa2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f5ffd2bf14225ae30d85acaff033f4ca/59218319455.pdf In PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/jinoxokolemajewegazugu.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/65022974422.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/xasunaraxexibuvafugur.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/xetosojudabuk.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/57677448527.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9b722ada1f7ba3af12ff04681ef61f6e/lunexifusosego.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/9721781847.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tagod.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/66604844031.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bowilumimofakoniremupijoj.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/gopolovubef.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/67895165492.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/28350411958.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/ziwalekapifamiximo.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/32561570686.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/narux.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/zujebekulasegeladubuv.pdfIn PDF document text
    • https://trainova.com/userfiles/file/dovaperomel.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mesodalox.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/500798243.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/070450116334.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/kitum.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/68742582697.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/neziwarukej.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/vutujibaxapojunu.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/furovazilituwisopawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+instagram+followers+plusmeinPDF link annotation
    • 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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 15856 bytes
SHA-256: 5d8f27719369d1bf11fc1244114d4bd0a144de0fb9927dfe936c97a8200d9fae
font_01_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10864 bytes
SHA-256: 7d50cb4fd44dbeb7d7be14f43a0c4a8badb3a70cba3cbcc3e25718736d469a0f