Malicious PDF — malware analysis report

Static analysis result for SHA-256 361535149f50c631…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 01:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00e0467fa0963894d5448a82f9f73ba9 SHA-1: 7741af8b9d5873904e972704b46b7a95a5542f91 SHA-256: 361535149f50c631e6dcd0257130264adf93d5e2a8767837ce411889bb2de507
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites via the numerous extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://tarsiman.ee/files/file/romugaromowogotezitoseg.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11313556624.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161487bde39695---pizesimisusajasozalaver.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/weguxabifewuvovikef.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/dokanufitofegojipela.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22502930389.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/gudis.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/tojixevoribamimivuzizut.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/menalened.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/fozigadiwasub.pdfIn PDF document text
    • http://sbcnepal.com/images/file/vesoxawasulaneru.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/zewurokovadorexelafadarav.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/99990248006.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/96408251238.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/notavogagisanepaxovukumif.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/75403204675.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/vupejutukozakiligo.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/19234917425.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/wewexerefidirinomutufona.pdfIn PDF document text
    • https://auto826.com/uploads/files/44040297012.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fokanijarajarinesok.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66536514---bogeridusope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vidmate+2014+old+download+appPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 18288 bytes
SHA-256: d42fe280a2de06211caba9cd694b2505ee93f799c56de6e3b2cb98c557c88111
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 10712 bytes
SHA-256: 2f9874d1dae31048012fa076eafdcd96a699cb1d334db7177759eca8de12ef0a

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