Malicious PDF — malware analysis report

Static analysis result for SHA-256 863498ff4cafb129…

MALICIOUS

PDF

79.5 KB Created: 2021-10-15 23:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca9c118ec199cff1811564d353f3bfd2 SHA-1: fff91487fa2d5d7f872d2526b7dc1df79236c82c SHA-256: 863498ff4cafb12980bb45060649fd0f8327326c029b2c98c12d86ba060c8a9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://belretail.by/ckfinder/userfiles/files/tavaxux.pdf In PDF document text
    • http://avanti-kuhni.ru/upload/files/ziterelawok.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/59979928166.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/85249688274.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kizokitonudobujojexokogok.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/tulufovozuzak.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/57262867865.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/92984186212.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/bifubi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/14897563070.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/23605825253.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/5544475669.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bopizadujokiduta.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/36993093756.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/22569041400.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/mexebadexevaw.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/rigutenalefawemenaligox.pdfIn PDF document text
    • http://pmke.cz/pictures/files/dogonekisunukuv.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/dofoku.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d54b4c7b8---zotasokafikilejiser.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/jokupuzirozegivezuzajaj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161590e415e9b5---40679206840.pdfIn PDF document text
    • https://istanajp2.com/contents/files/26604579880.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=how+much+is+a+purebred+maine+coon+catPDF 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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 11048 bytes
SHA-256: 4cab0621d6497cf4e0871eba12f6ff8ae742682f4f736805dd00487565c4d029
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 16548 bytes
SHA-256: dd978b963f6d07482ecc47df07a71ca947809d122e85404af60bb8d6c04e92ae