Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3eda31e2bcdbb7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 13:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51e20538ade3c52c261275e65e65a960 SHA-1: e8a52a0d4c8cc13f68f9622d07961b5a1c5060e1 SHA-256: 2d3eda31e2bcdbb741d20e7b255c0589b37e7a39cb2aab9d0c2532452516fdfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely used to distribute malicious content or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=little+singham+kaal+ka+badla+movie+download PDF link annotation
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f7d8900059c6f5372c7d363bbabc0f93/vuvumasavasagasipafunuvi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/99660917012.pdfIn PDF document text
    • https://suksesunited.com/contents/files/rarevetulalukudoragu.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/dikewedodaw.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/kuvabijurosoz.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/xivap.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e78e95f8b6b071b392295f9c3efc115d/61196636645.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/sezezufamuwegoda.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/37096942115.pdfIn PDF document text
    • http://c-amc.com/upload/files/5957522991.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/70885947936.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/30507728216.pdfIn PDF document text
    • http://vinmexindia.com/uploads/wifimafalatuwex.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/xoborowobomomikedaxe.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/644ef82eb6cd5f242e6d780890432112.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/63523524884.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/zikomanoveri.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/vawurisulimebu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wuramigekosajigiluvowopo.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/82024982063.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/78369834027.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39405248587.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/dixogadofip.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_off0000c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 18076 bytes
SHA-256: 9f2ff1faaebc0fb80143571f7ed4a0bc0908f51bf8840874945ca9e2964dda09
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10936 bytes
SHA-256: e1ee781a8140f7445b5517530fdbc6388d2e4658981924aa5ba07a6afd562a72