Malicious PDF — malware analysis report

Static analysis result for SHA-256 a945e5ecc3e9c95d…

MALICIOUS

PDF

92.7 KB Created: 2021-03-03 05:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 552e00e6317d6ffb18b03ddc986fdac1 SHA-1: 21592ffd80dc139191ab323e9f9cf51630355449 SHA-256: a945e5ecc3e9c95db2ac4fbd9b568e9c9cf4e4b58ce4422a3de8adad34a71014
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution vector.

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://leonvi.ru/strik?utm_term=hydro+power+plant+flow+chart PDF link annotation
    • https://zivexipoter.weebly.com/uploads/1/3/1/4/131483036/1905253.pdfIn PDF document text
    • http://update-win20.online/116603275xxbpy.pdfIn PDF document text
    • http://lasns.fun/78139458860t7xzr.pdfIn PDF document text
    • http://gta-msk.ru/international_criminal_law_textbookgp7vg.pdfIn PDF document text
    • http://zivepixafusav.22web.org/spiderman_3d_games_online.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/803755072907c61k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc5e804e2281.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/shutter_movie_in_tamil_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/ejc6hbl/20737780682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fd3817dca374.pdfIn PDF document text
    • https://morexenuf.weebly.com/uploads/1/3/5/3/135311883/vikesepofobadipuve.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/jdicgfK/rokigukajiwamasupo.pdfIn PDF document text
    • https://luwimejimidilen.weebly.com/uploads/1/3/4/0/134040945/beb135d5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nugafafekovad.epizy.com/amana_furnace_80_sse_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/gy-_521_datasheet.pdfIn PDF document text
    • http://jebefufodapiwi.epizy.com/rawodudi.pdfIn PDF document text
    • http://bajivuselome.epizy.com/definition_of_teamwork_in_the_workplace.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_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 5220 bytes
SHA-256: 000cee2370487aaf122495975e99367874bf5b9500da8d0274828456977db78b
font_01_sfnt_off00013bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBE 12500 bytes
SHA-256: d068fbf6b42cff3c7746f0a0708b06297f55d6bab25d35d4df9fbc2c2d3ee75f

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