Malicious PDF — malware analysis report

Static analysis result for SHA-256 47507cfa710d55ee…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 08:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddd71c17edadc9d90d8864b73a34852b SHA-1: b640bc825e37f157481e4f6267c091e77e79b4d1 SHA-256: 47507cfa710d55ee58944db289ce10e4b1822e98cb0aa04e5b8d12a762efd92a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure to prompt the user to install a browser extension or update. The document contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://bebsulmare.com/userfiles/files/feluxisonolapasavefizu.pdf In PDF document text
    • http://architettogherardi.eu/userfiles/files/tavivigebakevexu.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/78544750865.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6137FC77AEEEF.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vatozumoreko.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/kekizexejagigorajogaxa.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/vizabenofone.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xevugevuvexinuxu.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/xigugenosotamuxa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/71fc9253913265972e4033d62bdf1cb8/dodexajapijuxana.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/80137796328.pdfIn PDF document text
    • http://ashleymongolia.mn/uploads/files/493887290.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/32240421117.pdfIn PDF document text
    • http://toroisg.com/public/images/files/39619954638.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zemoje.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/zuzezaxuwetikabazarijemun.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/30250625284.pdfIn PDF document text
    • http://badgerhillfarm.uk/kabomaxo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd95e3edb7---90467872368.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/nodoluju.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/natipekidesojupitogu.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/solujezuwonivukadafuweli.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/98929669354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+system+webview+and+chrome+not+updatingPDF 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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 18696 bytes
SHA-256: cb9299cb44c2a170937e51481dcdc817409f236a3f79988f199daaf4f67d36e0
font_01_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 11404 bytes
SHA-256: cda29b56e53678f4806897eb2f4a67763c5dd173ddceafaff764bc8fc3fc42ed
font_02_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1