Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8bf5dc49bcb8a6…

MALICIOUS

PDF

73.2 KB Created: 2021-09-22 22:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ec63839eac5712fa5d06c3fdaf8b42c SHA-1: dd3ac19c9c40675986532eeb986a50d0ec4ae48d SHA-256: fc8bf5dc49bcb8a6bbd3776aa5a21dc2e02dd18972b7cbe54f10dcf45df54023
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a fake invoice lure. Although no scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content, likely for downloading a second-stage payload. The presence of multiple disposable hosts and UTM parameters in URLs further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://minlinart.com/archive/upload/files/90673643149.pdf In PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109050702579201.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/jagururujidibajetutolobaz.pdfIn PDF document text
    • https://mar3ol.com/Files/files/wogusasipod.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/27668621931.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b031a1bfd7---46386191887.pdfIn PDF document text
    • http://getvisa.ru/images/File/wojatotisosulovuxole.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/risaw.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/68605950473.pdfIn PDF document text
    • http://bastola.org/userfiles/file/41460857867.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/66831981229.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/91541574284.pdfIn PDF document text
    • https://alkoplast.rs/files/94298956963.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/65446809716.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/17609851447.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/piwalefogozumekotame.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/wutubagasidekubovej.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/xexiwojiwemesibi.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/ruvono.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/faxikadoromakutigapin.pdfIn PDF document text
    • http://chineseclothingonline.net/File/wifamogejexetizowok.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/29370255396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=letter+to+past+clients+real+estatePDF 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_off0000bf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF79 10324 bytes
SHA-256: a126ccb97fe06ecf3edf295671d0646d6e7e2897a747077b26f3b78efd5160b6
font_01_sfnt_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 15832 bytes
SHA-256: abfc4fcd4e65cb76864ceb55b9fb147c43d221e400fa65ab4b5d7719f0aa5131
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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