Malicious PDF — malware analysis report

Static analysis result for SHA-256 1243a5e5cadfda0e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 04:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d5798339778c8e277665a5e14e3e3ef SHA-1: 7dc088af5fa18de504386ffa35712d808149d080 SHA-256: 1243a5e5cadfda0ed4a43b77553b8fc27b3594d6328e7f1699c01a984f1ac824
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection and high ML score indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm, likely for SEO poisoning or distributing further malicious content. The embedded JavaScript is likely responsible for redirecting the user to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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 http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/pibazefugitazuzum.pdf In PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/72448404647.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/9772761591.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/mopavef.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/34257527107.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4qikskiq8v6b4o8m1ltacvdc93/najumuxatipegemunojuvod.pdfIn PDF document text
    • http://goldia.cz/data/file/94126579490.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/92039853674.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/lekoxerepalemiduba.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/46594187387.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/97074131043.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/81084688841.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/zelupid.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/78062841409.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/55539804085.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/vamegilivowiwufi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/45091109008.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/batodevaregewow.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/xemovosatadudobujikodox.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/99570247840.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/2534695357.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/vigimuk.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/43022130959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=computer+electricity+consumptionPDF 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_off0000b472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 15280 bytes
SHA-256: 26f2fe0473d6d11560a5220b66f31f6a5fe0eb9b5b952e32181772ad4d45e8bb
font_01_sfnt_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 10620 bytes
SHA-256: e3f2db714d680ecd61d51156d00fefc98c4ef431cf3a2841aa441302999ef2f8

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