Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd11b6b0e83dd96f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 14:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e94bf873cf74b5f8c85fbae52125fb7 SHA-1: f071695947094d19be8221a74304d6a5045e785d SHA-256: cd11b6b0e83dd96fc050078073ceb1796bca7ad05ce4c1754202db0040c3c524
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a link farm, with a high number of distinct external URLs embedded within it. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. Although no scripts were directly extracted, the PDF structure and numerous URLs suggest it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136870cd48bd---81154138324.pdf In PDF document text
    • http://unicaconsultoriarh.com/images/files/wizur.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/gowokikebururipibuno.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/36297502826.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/61745137042.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/84199770377.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/49375457703.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/66084884008.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/nagel.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/17587525193.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f137e1e6---56204653299.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/83612653829.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/23285149745.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/dusenededifosesu.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/85653379727.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/37939078742.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/43610361519.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/bubuvowazenamizipazum.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138790b5e395---7663197000.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/5433952149.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/matipedulofo.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/giduwibib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=yellow+version+cheatsPDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 10464 bytes
SHA-256: a06619fb07df397324871e69c2c100d3d58bc8aea9259f7747ed454d2f027d9b
font_02_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 17920 bytes
SHA-256: 1d776ba8c94aba8d602664aeef1e737d9debb7c1889b230669ab785f709b3382