Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d7b4d4c3a92047…

MALICIOUS

PDF

85.5 KB Created: 2021-10-04 13:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc03bf6925bb5cf56c247dc95be29b7a SHA-1: cc4217a6c4c2049db4669ca3422dc7f9f9afee42 SHA-256: 36d7b4d4c3a92047c555cff80db981068a4dfeb28e3ddd04db309b1279c23581
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous external URIs found. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://chcial.ru/uplcv?utm_term=black+ops+zombies+tips PDF link annotation
    • http://hotelrealerimini.it/userfiles/files/7759411296.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630686745/files/81946923136.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/gebosowasazaxemubifugos.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/rikemudi.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/xapubapedewumi.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/muditarexasara.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/69829622210.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/71925865871.pdfIn PDF document text
    • https://techlan.pl/files/file/7534350642.pdfIn PDF document text
    • https://luminex.pl/upload/file/38458619902.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51faa6de8---57891943475.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/32954725620.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/27948825561.pdfIn PDF document text
    • http://harlit.com/upfiles/file/depilibeluzerumebid.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bef977741---lidagedosafijawusokosoxe.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/96210234223.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/82688179011.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/13459671404.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/61746112303.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/xikofazufudimo.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/91217225902.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/serinutiniwutirozow.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/81002904060.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/55766004029.pdfIn PDF document text
    • 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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 21216 bytes
SHA-256: c379762d90ae920de8147eb70bc638e194996720c46045c358b99d11c23dc0ac
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 10676 bytes
SHA-256: 31204142b4318127f22a4ce7f4aeed15c7a3adf74ac08c3f84f79bf3a64a305d
font_02_sfnt_off00013086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1