Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b500838721e6b3a…

MALICIOUS

PDF

85.2 KB Created: 2021-02-28 21:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 57a62c4595d93077c0969e75db53ac2d SHA-1: 4a21623acfbe71d5128f7bd9ed5f79610d82811f SHA-256: 5b500838721e6b3a096906730ee36d86f8d97853b5f0e2eba04d4aba4184301c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the document's structure suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://druttle.ru/award?keyword=beginner+python+3+exercises PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474170/normal_5fd9023e3a35d.pdfIn PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/kufozigowezu_kunedarexifitel.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/81114329122.pdfIn PDF document text
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/2613e188150.pdfIn PDF document text
    • http://gujatun.iblogger.org/xfinity_xr2_remote_codes_for_cable_box.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372360/normal_5ffe7a2207475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fd177b7e59c9.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/c4db7e1ea7.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/NnJ3gem/wubofakapeloduzobogitaxa.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/what_was_the_cost_of_living_in_2018.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/bloody_chamber_summary_and_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/15808750684.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/27782805380.pdfIn PDF document text
    • http://gizafetagox.epizy.com/jonivonenabojajulipar.pdfIn PDF document text
    • http://fonaxijulobep.rf.gd/does_a_month_to_month_lease_need_to_be_in_writing.pdfIn PDF document text
    • http://fasupulujunisen.rf.gd/big_green_egg_large_firebox_price.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_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 5336 bytes
SHA-256: d64521761659fb3d54f9770b8ad22ea16eb1e34d9dceddb88491e7d9100f4be4
font_01_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 10644 bytes
SHA-256: cb34d808c0362ef482b58302dfe7ef0c4464b184ca9e5bccecf5493eb9cf0828

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