Malicious PDF — malware analysis report

Static analysis result for SHA-256 c678113db85a61e5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 16:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4731499d1a2385038b938bbba53f84ca SHA-1: e1ea9c0b407a3dcea9fa01748ddc9ef0f40ca1c4 SHA-256: c678113db85a61e55b6036a7a4502034be4cfb6789bcbf24b32ee99b13a3c2b4
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick users into downloading a password-protected archive, likely containing a payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://queure.ru/uplcv?utm_term=open+protected+pdf+without+password PDF link annotation
    • https://tectrongim.com/uploads/files/dituvaminuloko.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/49826157000.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/40510100257.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f097d191db---55561545587.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b126cc926---90445762704.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/78044306678.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/repapasozogut.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/kitevonepoxopuge.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ratofijopijavajaxotijatej.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/dedegoravujemizekinu.pdfIn PDF document text
    • https://ottopianos.nl/files/vizaduxagemafonibukulof.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/niparogobeferu.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/49906582214.pdfIn PDF document text
    • https://wittnebel.dk/file/jidakovifasapemefidebeji.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/63934312467.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/91448864547.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/pagate.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/51447854834.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/vasisadodopinarotogazatut.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/71435563787.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/vilixogojef.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/51470719710.pdfIn PDF document text
    • 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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 10884 bytes
SHA-256: b636fb304cb4c24b3d494467f3ff56784645a3d96d32df5d016d9fc2b7c78ac9
font_01_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 17148 bytes
SHA-256: 53ff89563cbdb3f5a6a74438153820c9238d7ece657cc36b7aaa291cf1013c60
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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