Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db347e2d6842cb7…

MALICIOUS

PDF

76.8 KB Created: 2021-10-19 15:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 821deae18d61c8006d76dea43737e473 SHA-1: 885c6936233f0bb91e31e264219abf75ec67451f SHA-256: 2db347e2d6842cb73c9f41efb4d9935dfe8c074c8714ce9806909314802b2e24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for other malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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
  • 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://liburnia.pl/userfiles/file/luwumebetafujibizokede.pdf In PDF document text
    • https://open-call.fr/uploaded/files/30475472298.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/27749371537.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/23020920243.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/linilezowor.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/70908567776.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/bapovufam.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e483372873---paruniwug.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/35167737848.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/retejenuguxibemewugedemet.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/57229264014.pdfIn PDF document text
    • http://live-net.it/file/8074957594.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/36236702841.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/36179744868.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///lozim.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/89463294618.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/31937549050.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/60340606612.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/9331802617.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202110060149428345.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/zibuxafezipifamitoboretib.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161444ad6ca1c4---2917398655.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=alguien+tiene+que+ceder+online+subPDF 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_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 17520 bytes
SHA-256: 83ce7bdcf9fb467550019255140bb922a04bb1679febfddac487b499fb1af8a2
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 10748 bytes
SHA-256: 8a8b5952f7d93dccfd05ee09176318884e0efd83b426ffb69fa891b843ca69c3