Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4100128d66103bd…

MALICIOUS

PDF

67.9 KB Created: 2021-10-09 19:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12d0a1d4eca45b5b511da6ca41385456 SHA-1: e215fe5b0c7af92de55cca207864b35f9bc3a64c SHA-256: f4100128d66103bd5e7a2e660ad0b88d3cc8b84ee64b846ca1ed03a2072a5644
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm, designed to redirect users to numerous external sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8303

Heuristics 4

  • 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
  • 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://aqua4you.hu/userfiles/file/23370822156.pdf In PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/xorusuje.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/17801977853.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/tebabu.pdfIn PDF document text
    • https://bawauang.com/contents/files/81952591863.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/76094302952.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/20326726790.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/4167038425.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/65873438894.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/loxubetovekesesamo.pdfIn PDF document text
    • http://decorstore.eu/upload/file/mogolijobijigupojokidilo.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/dakavilavogufut.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60028915417.pdfIn PDF document text
    • http://sireny.net/share/files/44478270460.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/firidazafite.pdfIn PDF document text
    • http://demkapi.com/resimler/files/baxoganisibol.pdfIn PDF document text
    • https://tigaintan.com/contents/files/95348558122.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/17696406766.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vifab.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/32455997217.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161603f3a22d60---solejodav.pdfIn PDF document text
    • http://ud2-140.com/files/radepugorotelajelexovizob.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/23347981379.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/36d9168c734606b50de492ce66f2bf67/10982294188.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/57250502396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fainting+from+stomach+painPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 16688 bytes
SHA-256: 1006828233735afb64711c35676a800fa6656ce6217d35616bf2181d3e1b9823

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