Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c94a09ed32021c…

MALICIOUS

PDF

71.7 KB Created: 2021-02-21 08:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7fbeee85b6815908a3e2f415f7a9043b SHA-1: be63c6fa1114235bf218bddf88ef2d66f2cdbf7d SHA-256: c3c94a09ed32021c31ec148032ffaf006c4f9b085fbcb9a60e47c7f2737a400b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for web-based content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=what+was+the+brown+vs+board+of+education+supreme+court+decision PDF link annotation
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/tujamakelane.pdfIn PDF document text
    • http://mattelipsticks.site/gardenscapes_2_free_online_no_downloadwv18y.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/ichbpja/15533074456.pdfIn PDF document text
    • http://jotewelife.iblogger.org/google_spreadsheet_add_dropdown.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/e3sNgdr/xizakenavisafuxebelir.pdfIn PDF document text
    • https://jemewifawoboxe.weebly.com/uploads/1/3/4/8/134872293/kaxupunipanomivab.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/puicjgS/food_wars_season_2_ep_13.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/moxemazabuxafit_gunefotixazo_xotavujurapaniz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefivaz.epizy.com/23518649511.pdfIn PDF document text
    • http://jijabivu.epizy.com/application_form_template_for_university.pdfIn PDF document text
    • http://danofida.epizy.com/capitalism_nature_socialism.pdfIn PDF document text
    • http://munomofeduvuwe.rf.gd/panaxanenomupuwosadosa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 5668 bytes
SHA-256: 9101f949828ad22c00cd318711fa177f90868b7d0710a00716dd07c51e14deef
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 10868 bytes
SHA-256: 0c6f2ae09178559d407fe7360fa9562a6c34e4056cfc31fd42813b0c62c807d0

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