Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca0f3c81d8bad6b…

MALICIOUS

PDF

89.9 KB Created: 2021-09-03 20:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5fa7dd7e8fdd819f2b05e2b36cd61f3 SHA-1: 2e0be96db9035dae52abda1154be89a6fcbb05aa SHA-256: 5ca0f3c81d8bad6b26c026c35828f87d5ff30dce96fa2c0616164af442d77b11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a strong intent to direct users to potentially harmful external resources. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=hadees+books+in+urdu+sunni+pdf PDF link annotation
    • http://ski-experience-japan.com/images/blog//file/bolujenep.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1927dc3bad318135c5b637057283afb1/sasosivowujip.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/gopanexaruruk.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/7786044434.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a070766fafb---3660271901.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tofatuleragozag.pdfIn PDF document text
    • https://isosklo.cz/uploads/80770706762.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/18019803679.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/71931072641.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/55662694062.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/50524134757.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/65280914482.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/26294675483.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/62318124501.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/janatumuliwevelazekefu.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/vikukagulomo.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/tuverowaxominokofatexirip.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/buxajivanisubuf.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/lowebaruvadotoza.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/5557914120.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/80116491436.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_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 20732 bytes
SHA-256: 08857efe41a231d6740bdb8cca0a3a73f5cb40ba407c2faaf3e501d941d79f8f
font_01_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 10672 bytes
SHA-256: 4deebe410cce96e9aeba2c0254dd3bd257d962e3800a83b400f17279aff5aea6