Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86873a170d685ce…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 10:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b3dc1da01e123448d3c11765a91d120 SHA-1: 6815480fbe157956700586a068072dd02cfb2ea6 SHA-256: d86873a170d685ce541e353f4b22104f6935426b5096103de478fb8315f8c843
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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 http://ues-rb.ru/themes/ues-rb.ru/files/21965218508.pdf In PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/25965043723.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/5759974918.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/gavumevofobusirot.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc68d638de---waxamadoloximezojisugow.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/32263771029.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/fanovukinikij.pdfIn PDF document text
    • https://kuepancong.com/contents/files/fuvet.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/niluvufosaweda.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/turizapex.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/fatizifadivivaxokegedo.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/46877591932.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/jaweluvuso.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/34604657690.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/5644975544.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/fekoxo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dlpnsgmrm90lb3a8orbskq862h/joluxoje.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/90584820818.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/46544580832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=generic+structure+hortatory+expositionPDF link annotation
    • 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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 10780 bytes
SHA-256: 226f2e1d2ca3ff130f4014920bddf7f16ed14218a7d14edf66b608e1f4d887cb
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 18776 bytes
SHA-256: 39098bf44cd847e9c3e879b6b34d400c53a3f04024e4ba6a430e6f1db0735e03

Open this report in the interactive analyzer, or submit your own file for analysis.