Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c21763027a6dc5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 15:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85aae6f5bfe6eb69e70b82b23ac0bf5f SHA-1: c6d7effecdbd44bf5f72f12d5debe593470f4a68 SHA-256: 49c21763027a6dc59f85da6e3d0b9cb2e52ed82843a8f2a6e81be0502de25403
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=disable+predictive+text+android PDF link annotation
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210918110546.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/rupimorekaputeleti.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/vujopemavasibepori.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/85e89819e502d1c8171049a27678eb4c/71006008651.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/dubijotegotutepunolut.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/dufibavezapuwi.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/28064814250.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/77359454893.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/85612267783.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210916054824.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/fugigefurifepive.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/jobazemiv.pdfIn PDF document text
    • http://cbstav.cz/file/moxuvedinuvizajap.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/61427822705.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/mogajabawebaza.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/12447634310.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/jisuvorunabo.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/27773594927.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nigil.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/kepomebaginorurovuxebi.pdfIn PDF document text
    • http://dsfly.com/uploads/files/38966058703.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210907095433.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/pulelufujizi.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_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 18608 bytes
SHA-256: bebeb908f4194e8915d21021dfe42ad09471f5e427bb9e4743e684aca6227797
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10816 bytes
SHA-256: 99d1eb0be5f7c9b0ea4a057174406e93c15e53bafc0ba12cfcc8ae1c2e097469

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