Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a32a8d357ef7f9…

MALICIOUS

PDF

76.1 KB Created: 2021-02-15 08:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 00f8910e0e35476f62524beaa33152d9 SHA-1: 479cf1b5a21d4ffc705f0a15928ae4549a130ac8 SHA-256: f3a32a8d357ef7f9f18d7a452f03f3c0f72670617f86fc2fb3d43800600f4aa5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a recipe, directing users to malicious URLs. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://seumenha.ru/123?utm_term=pampered+chef+cranberry+salsa+recipe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413866/normal_6013065466571.pdfIn PDF document text
    • http://mxbur.fun/converting_mixed_numbers_to_decimals_worksheetbi04o.pdfIn PDF document text
    • http://antileqphh.site/sheets_of_plywood_jewsons38mof.pdfIn PDF document text
    • http://copyright-securityx.com/analogies_worksheetz6ec6.pdfIn PDF document text
    • http://copalofa.site/input_output_tables_worksheets_grade_7evsop.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/jubajule.pdfIn PDF document text
    • http://ergors.space/wugidamafisfw0ce.pdfIn PDF document text
    • http://jobauthor.online/93161265968puvkr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480584/normal_5ffb68a6d9886.pdfIn PDF document text
    • http://idealica-italy.site/17517814566002ub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_600cf5f04ba6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_6011362dd04f7.pdfIn PDF document text
    • http://misstourist.info/bezudizikuxifagoxamefxk7h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tudozujuxijoz.rf.gd/jeffrey_campbell_platform_trainers_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/tipiwubopa.pdfIn PDF document text
    • http://novoniranalisa.epizy.com/badijib.pdfIn PDF document text
    • http://jusudab.epizy.com/tifipononuxu.pdfIn PDF document text
    • http://bofozimugonofa.rf.gd/windows_10_activation_toolkit_free.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 5640 bytes
SHA-256: d3fa27475fad8717dff0d87bd59f7bed07f644ba2ca16932b695745ea2d92df4
font_01_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 11116 bytes
SHA-256: 93bca893213e7c67e951ac04bf9f3895abdd95595feda0b8131b99b0cea8698c

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