Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce614614d96ef9c5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 12:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b1cd6d2c81d4cd7754538474bcb9d3e SHA-1: 2558cc494edf42cb318893d920fe37cc35e99eca SHA-256: ce614614d96ef9c5ef9183146a862998396d67de68ea18bc99af0edd1be23a54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=how+to+remove+applied+theme+in+redmi PDF link annotation
    • http://kibbkw.com/uploads/file/lasasuk.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/rujiwizolevuxajog.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/wuwumosofub.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zoregezibevo.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/parepowirakekepemafado.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210904031209.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/27599897026.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/65059784395.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b73940cd3.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/niguzezibamoxutarokux.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/19340140552.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/091889b940fe13e413194dd0f16f4af5/37174949767.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/dabamobuloxabos.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/muwetoxapunuz.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/59357035845.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/kusezanawewit.pdfIn PDF document text
    • http://lukinserv.hu/file/67630164593.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/voxamivis.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/44806671625.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/88370543945.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40744420694.pdfIn PDF document text
    • https://hobbypet.cz/files/file/66617430175.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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 17728 bytes
SHA-256: 3d699c75f57cc308646e41626189f92f7139eb8335c6460f99efcd9c0b2d9ae8
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10632 bytes
SHA-256: a35aee1e5c2d5ddf3ae97c022ec2ecc1b1a9ffd74cfa5376d470873dc7335744
font_02_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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