Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bee73ce73eccb5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 00:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5bf116491fb0c32d70c9c94d28dbcb8 SHA-1: 8b762355018321fa9a30e16b88ae66bfda8613de SHA-256: 96bee73ce73eccb53b006fe849aa1cafddb33e2b492976bc03cac4a3644845f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3e5e11503c6008dd4208cebbc2bf3960/83078718777.pdf In PDF document text
    • http://sanyosushiglendora.com/uploads/files/rawugera.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zanubokujuw.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dexasilivevuwofogone.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/76733519253.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210901201151.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04e6b6e4a---51773550525.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_852E3AE845C9059F.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/laruxatowi.pdfIn PDF document text
    • https://inarsindbari.org/uploads/37007592709.pdfIn PDF document text
    • http://biomehl.com/images/content/files/lixod.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/rexobuvetovokorepi.pdfIn PDF document text
    • http://puisan.ru/uploads/file/28088606293.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/43685118368.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/zunozuxupikiza.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62395029553.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/98033741199.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/mereminiboralorat.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/sidijovugugotunudabokutej.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tiluwobo.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/gemewojajo.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/16248375440.pdfIn PDF document text
    • https://songhongresort.com/img/files/dekoseze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=one+minute+manager+book+pdf+freePDF 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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 17892 bytes
SHA-256: c2bc9705ad4d2c92848ffdfc2275ebb244598f0255c488ed283554c3f15421e1
font_01_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 10984 bytes
SHA-256: 0610d2a5d3e9262f1bd03d82b72afaf02e9e29713bc524d6809980e2e76fb89d

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