Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4f8b3e22ac0f81…

MALICIOUS

PDF

77.0 KB Created: 2021-05-10 03:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3129537cf026e31e3958a1e2994659dc SHA-1: 2b0aa4506f0ffa8d7e2995f55a76ac8a4527b723 SHA-256: db4f8b3e22ac0f81dad26ff72e3f751b466e69a2db2a855da6bc0df703aa9399
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful 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://xajibur.ru/strik?utm_term=what+are+the+four+components+of+transformational+leadership PDF link annotation
    • http://miiliioner.xyz/amazon_alexa_echo_plus_2nd_generation5ks0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6052b77ed0f4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fed7a0c251cf.pdfIn PDF document text
    • http://leon-stavki.info/liburajivjpn3.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/5893278341.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/how_to_ground_balance_a_garrett_ace_400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_601011547f297.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/3kt8l.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/anteproyecto_leyes_secundarias.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5ff28a977a505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_605815fef2a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_603fab68cf1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_60631566768f3.pdfIn PDF document text
    • http://topsalon.xyz/36997050040l9x5g.pdfIn PDF document text
    • http://the-glow.ru/ematic_at103b_digital_converter_box_specs7dwqb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5febdacf0d68f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfebed0-14e7-4c72-869d-b4c43028a65a/hannah_arendt_on_violence_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5acc0c55-fc91-4e4b-a856-ef4c6a7b1ddd/etica_para_amador_libro_completo_por_capitulos.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_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 5408 bytes
SHA-256: 8cd7ae484c0889c8c4f12c9731b7ca2814c2ed7adc07c04631c0d5fe6cc3564c
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 10180 bytes
SHA-256: e13d5d3f5ab161ff4f4c4390bec1a7f230451605727af974bd7d64ced81ff889

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