Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63aaa5bb3365b5d…

MALICIOUS

PDF

85.0 KB Created: 2021-02-25 13:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 62a8f023d61ff8ff198a6b43109e4386 SHA-1: 31895207dff2a88cef0d4a21536436aca294803f SHA-256: b63aaa5bb3365b5d859ce5f5f2630d99c07a13c598c9d1e07e090905c531850a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with a significant number pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt 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://jottigo.ru/wb?keyword=how%20do%20you%20fix%20a%20toto%20soft%20close%20toilet%20seat PDF link annotation
    • http://summerita.fun/fipuvexbaz66.pdfIn PDF document text
    • http://cabinetshub.xyz/comic_book_template_powerpoint31n7g.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/3452d9a841.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/bhagavad_gita_quotes_on_love_in_tamil.pdfIn PDF document text
    • http://glawerry.online/owners_manual_cancun_rentalsf8zmv.pdfIn PDF document text
    • http://magic-world.site/ice_hockey_game_toronto_schedules57b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://narusalino.rf.gd/jikela.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/35030946769.pdfIn PDF document text
    • http://pidelusinurak.rf.gd/nurojapixatipomop.pdfIn PDF document text
    • http://resifukizuve.rf.gd/bifusekinejavup.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/47653782676.pdfIn PDF document text
    • http://fikirajali.epizy.com/best_robot_vacuum_cleaner_for_pet_hair_uk.pdfIn PDF document text
    • http://nununad.myartsonline.com/36347856363.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/android_studio_gradle_build_slow.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_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 5140 bytes
SHA-256: a548a397aae8f65af9894c12f12e249d1bd59c3119cb7db60b28218d5458e8ce
font_01_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 10812 bytes
SHA-256: 5ad012941afec9efce5ddee582de5e024416fbd403b6e5c43d152223a2c9b906

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