Malicious PDF — malware analysis report

Static analysis result for SHA-256 960f416a5075c23a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 08:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c619566f62bfde10bf7b6879663eeb45 SHA-1: 0ed23a13cd4cf3e6c36e473e71eaf2b506d61e08 SHA-256: 960f416a5075c23a2f5ae9001fb7c5cc928b09aa01c50063a2a0c8e155788cc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://nomylo.ru/uplcv?utm_term=update+to+android+6.0+download PDF link annotation
    • https://jagominum.com/contents/files/lamixosenotelujilasitatov.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/97424980456.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/vimuseviguraxilam.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/3957657775.pdfIn PDF document text
    • http://arucax.am/user_images/file/93735091686.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/jojigufaradov.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/ziriboxamomobaga.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/fakokabeti.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xudekuro.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/95428848788.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/10775953912.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210905_FB05D3B962A26934.pdfIn PDF document text
    • http://test-immo.com/file/22017389117.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/28434635230.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/pokimumote.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/52626127581.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/mezivol.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131595a7ab5f---surozojuwipezisukojalijid.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/11399073500.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210905135549345.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/zexagozokob.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/32400734620.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/20113628119.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/mizaka.pdfIn PDF document text
    • http://yuhongzg.com/d/files/pexekevu.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/49175608253.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_off0000b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53C 10664 bytes
SHA-256: 1f03e7f5134c6d735d124b593a11fc9e710538ba393730669ec295d237f629f9
font_01_sfnt_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 14872 bytes
SHA-256: 1c5f677b625b0b78c6a59cb0fd77f4e62ff945a020a0d6b0c4287ed67340722c
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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