Malicious PDF — malware analysis report

Static analysis result for SHA-256 5067b960e8ecd345…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 07:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1db19daae82df860b6acde5132b48b0 SHA-1: 7faf1f211136f8fe8f42bca3a9b239e10b737a5a SHA-256: 5067b960e8ecd345f07d965b967cb76f5f9f28c329068adfd30e53e7b72f8e97
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing 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, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=best+photo+editor+for+android+phone PDF link annotation
    • http://ranch.pl/files/file/85470978846.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/14282966075.pdfIn PDF document text
    • http://holzweiss.at/balofuj.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/12713678724.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/vomubopobevog.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/pozozonamatutijus.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141cac7d4045---92583201915.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/47148032942.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/16ac22cb03338579378a6e5a8f176fed/rezatipapiga.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/fasefedotupalomisira.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/66049257418.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/gegefikipisoj.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/2814182732.pdfIn PDF document text
    • http://17njl.com/userfiles/files/64069891592.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lelotumigigironef.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/57230103179.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/guxaxosolawutimosekovotu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce4aa462d---81151813141.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/7553529417.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/vovosawotomutirimawitusip.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/49949114236.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sodisodefabejonepe.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/doruzinirimasajuxes.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_off0000aef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 14488 bytes
SHA-256: 1d9425fa39e24564e090627c65451dcbdae559564e84409171ce6ff626c4ce86
font_01_sfnt_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 10600 bytes
SHA-256: 495e1637717df5369201969f6a3afcf33727d67294f031d6d1db247264f59c7c