Malicious PDF — malware analysis report

Static analysis result for SHA-256 8361c97a5c00dc1d…

MALICIOUS

PDF

96.8 KB Created: 2021-09-13 19:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bfb0e96295b94118669715550ed4a9f SHA-1: 937533a153791bdc79cbf6bd32f25ccec68965ff SHA-256: 8361c97a5c00dc1d39b040c6cd2474e908bc2b870fe00525eec0e813a7d47b0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to potentially malicious sites for phishing or malware delivery. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crysiq.ru/uplcv?utm_term=the+grinch+full+movie PDF link annotation
    • https://theelementrama9.com/userfiles/files/pogiwukexulo.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/dukuluxezezopekive.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/kafoge.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/28916253873.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/fapodubaduxoriton.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/mulepum.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/jogewuwaz.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/15331129391.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/nazovekarepevibegitoko.pdfIn PDF document text
    • http://autodilygood.cz/files/file/xomapebujoz.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/70299436875.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/74044422626.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/vebivelet.pdfIn PDF document text
    • http://cke.hk/userfiles/faramanorofadaneguz.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/meloz.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/mawenevosatukokolaken.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/titanemopojubelenalego.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xubajakijesigetuni.pdfIn PDF document text
    • https://mackbeks.com/files/file/temitisegixigijofipofob.pdfIn PDF document text
    • http://aquatherm-graz.at/files/bedoj.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133054eca7d0---tasazapoberorovupelotapa.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/68344797539.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77706491123.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/27226417166.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_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 18328 bytes
SHA-256: 651f9f0afee3aba0f154de71baa6a5da863845f62869f630a5ed75dd718f2633
font_01_sfnt_off00014621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E38 10484 bytes
SHA-256: 2a485f7281a141ecf68430404fb638dc86c8e4233d1443daa6148645c24bc462

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