Malicious PDF — malware analysis report

Static analysis result for SHA-256 47282f166c53f57d…

MALICIOUS

PDF

95.0 KB Created: 2021-02-15 17:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d8bb6de713b6f19c2f11c214a642d657 SHA-1: 711a2166b9361e026d2755c98a7ddd11ed4526b7 SHA-256: 47282f166c53f57d952e153f98206ceb70917a18c415a546c6711db7c3139c25
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://seumenha.ru/wix?keyword=clasificacion+de+los+seres+vivos+segun+woese PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421778/normal_60183e44e4fd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fc9335861b2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5ffb97398c4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413585/normal_600d6d524ba88.pdfIn PDF document text
    • http://myshoes.moscow/denididubixaburepezoxoc9k.pdfIn PDF document text
    • http://itasda.online/kung_fu_tea_holiday_hourslpkdo.pdfIn PDF document text
    • http://reduslim-shop.website/best_browser_for_online_videos_android6srxp.pdfIn PDF document text
    • http://frukt.space/bootstrap_search_form_snippetb7r3f.pdfIn PDF document text
    • http://italia-doc.space/cage_questionnaire_alcoholobu61.pdfIn PDF document text
    • http://tells.fun/13048799484ji1eu.pdfIn PDF document text
    • http://educationonline.website/695410781351qghf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fe00df1ef785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/game_real_badminton_mod_apk.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_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 5244 bytes
SHA-256: 0e6a899c4965791636f5b52e9c9663d20f2e315720accf4db6363ebd010ac00f
font_01_sfnt_off000145f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F7 12076 bytes
SHA-256: cb0c99f32ea077ec260d0e776bfc86139af8b105bb206ab8815fe7149f4d1f74

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