Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ed4e14319454aa…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 09:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd8d9d32dcf6b6fb84f12af43dd06610 SHA-1: b5b32202b5a126c760cb448f0e8b08d09bb785d2 SHA-256: 92ed4e14319454aa1cd4c433933e5c0d776a0525d92cedc66a01c001dc5ea565
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to unknown domains, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO purposes, likely to host phishing or malware distribution pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://fjzy18.com/image/uload/files/netamazudofigesuxoka.pdf In PDF document text
    • https://shevian.com/images/file/24809642164.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/tovosumixujewijelo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sarubapilabera.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/xodobepe.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/xuxilaj.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/rulugaxed.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/gafovameviluw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145397bdb949---37333565855.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/78697857326.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/rupolex.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/jidewusisogobikuxi.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/togapilewafiwovu.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bowodewizimoposewolexizi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f02597566ce5f501422687e6171ec06d/manurusakofupetutawuxiras.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210906005916.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/mojakuzezamaxopimizu.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/89569481460.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/bexajirosemiwuvekep.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/zujugoziserodixaleguw.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/pilebupefaloxo.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210911_135610.pdfIn PDF document text
    • http://na3.it/misc/file/fupomin.pdfIn PDF document text
    • https://khanikango.in/file/26622039862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=english+exercises+pdf+intermediatePDF 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_off0000c88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88D 11032 bytes
SHA-256: 1383e4566ae1ccc8784c4ead58bc017ae9bffcef038451bd6de14bb5831a6023
font_01_sfnt_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 17720 bytes
SHA-256: b7c491b59f4763f89eebd6e8c9df73aa91c0a18bd26e3269c76418328733b2bb