Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d84d7451ae75bc7…

MALICIOUS

PDF

72.9 KB Created: 2021-06-12 04:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d02101d187560215a2e69f4e0f82b430 SHA-1: cfb9fa2fcf1c43cd4e265e0fbf5e7b4739694c14 SHA-256: 7d84d7451ae75bc7e7054ee94db8146ea8374f2e8914c791c31bdcb78afbebe7
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary suspicious URL pointing to 'chcial.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable hosts for linking, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a compromised site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://chcial.ru/pbw?utm_term=the+present+spencer+johnson+pdf
    • https://zidereromozuj.weebly.com/uploads/1/3/4/6/134602294/81088598ae8707b.pdf
    • https://cdn-cms.f-static.net/uploads/4426415/normal_60527d515b627.pdf
    • https://midazumetewafaj.weebly.com/uploads/1/3/4/2/134266273/8105650.pdf
    • https://static.s123-cdn-static-d.com/uploads/4445119/normal_60afea825e3db.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/415e9e17f97d09.pdf
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5fc5b244dc55b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://joxupakager.pbworks.com/w/file/fetch/144600924/48894480571.pdf
    • http://lijegazoz.pbworks.com/f/windows_10_64_bit_download_mega.pdf
    • http://xawaren.pbworks.com/w/file/fetch/145165707/87644180381.pdf
    • http://xuvuvotaxago.pbworks.com/f/24282697513.pdf
    • https://uploads.strikinglycdn.com/files/98a22e5c-a0c0-48b0-a850-717f2d057d97/how_to_solve_ghx.pdf
    • http://lodenapokot.pbworks.com/f/83810380736.pdf
    • http://goxeguj.pbworks.com/f/nier_data_on_the_old_world.pdf
    • http://wuwolufit.pbworks.com/w/file/fetch/145102950/wugalotefa.pdf
    • http://kobowal.pbworks.com/f/amigurumi_chibi_doll_pattern_free.pdf
    • http://risuxujuvu.pbworks.com/w/file/fetch/145099872/camera_sensitivity_pubg.pdf
    • https://uploads.strikinglycdn.com/files/5d5cc7f8-4e0a-4c94-bca4-9209ac170016/70711788453.pdf
    • http://zuwofig.pbworks.com/f/edexcel_igcse_chemistry_workbook_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dced.bin
684877362b37d707c8af96e0eb56bd1ae157a53ded01f1ed55fbe7d3297d1462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 5028 bytes
font_01_sfnt_off0000ee0c.bin
67f435bede52a54eadfcaf441f4fa8ffae3f16abba66b31ae4e649cacbbbf26e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 11504 bytes

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