Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e9737e96c50866…

MALICIOUS

PDF

65.0 KB Created: 2021-03-03 16:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ac52f80b1370f225740bd2678e0f25f SHA-1: e68200f564cf35c571a5f780db8dcd74ec3f524b SHA-256: e1e9737e96c508669dfe0e166591a171e41263fec4e44e43489918c257aeac5d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or trojan activity. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=nick+drake+road+lyrics
    • http://bukuvud.22web.org/guided_cow_elk_hunt_colorado.pdf
    • https://cdn-cms.f-static.net/uploads/4406456/normal_600c72bf7c961.pdf
    • http://poruzur.iblogger.org/qradar_dsm_guide_7._3.pdf
    • http://sifamukuji.iblogger.org/android_get_folder_path.pdf
    • http://bafekovarobuju.iblogger.org/online_admission_forms_of_punjab_university.pdf
    • https://cdn.sqhk.co/nogorodizet/gfBJYmP/medication_reminder_chart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sobaketemu/kebepuxavejevufumomek.pdf
    • http://poluxik.epizy.com/16002148439.pdf
    • https://s3.amazonaws.com/retisovojor/1597559502.pdf
    • https://s3.amazonaws.com/fefurorobumi/4th_grade_times_tables_worksheets.pdf
    • http://nakarajibap.myartsonline.com/how_to_replace_a_ge_mwf_refrigerator_water_filter.pdf
    • http://jalebuvubo.myartsonline.com/5137036055.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_off0000c4b8.bin
abc5c2207799a7544b31ab2f4d0f98c3a842313ed280af3445ab854e22d08ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B8 5068 bytes
font_01_sfnt_off0000d615.bin
dd155905dd982c53ced871d2bb7f93569cdce15778f2d7e357667d6b1c7e4239
pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 9792 bytes