Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c136e77732c7fa…

MALICIOUS

PDF

77.5 KB Created: 2021-02-26 09:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3608b37e8c7271723ea01a62d75477ed SHA-1: 94ef404c93d3c16a979418b4324f76c7b615cc2c SHA-256: d6c136e77732c7fa15d07f45a7a69f6343b214e8eae5e4826d3dc1d008854b9a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards an attack pattern involving redirection to malicious sites.

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://baarspo.ru/strik?utm_term=what+animals+live+in+plants PDF link annotation
    • http://gejesixave.scienceontheweb.net/miremofuvukadi.pdfIn PDF document text
    • http://lovemecompletely.com/69173697115p2yxn.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/hfhaiir/pokemon_quest_vinyl_figures_series_2.pdfIn PDF document text
    • http://kamini33.ru/ronipu3f69s.pdfIn PDF document text
    • http://itactical.xyz/zopixumefejovepokapova4x6rc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/ijdjjhf/18972970502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fd0f16a645b3.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/palo_mayombe_books_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_60379a7d500a9.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/hfhhTjh/disemodaduwujiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/molodipikadirumulozok.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/vesugofujipuzodafumoburu.pdfIn PDF document text
    • http://bitines.myartsonline.com/how_do_i_connect_my_behringer_x32_mixer_to_my_computer.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/93168637739.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_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 5036 bytes
SHA-256: 43af9cd867761991202a42d6bfff03ba9f59dc9ff9ac3a16cd9aa169eb0f978c
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10088 bytes
SHA-256: 4243dfb30d78f52c5d07330f774e8977a310217980593434a2551f4621a94677

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