Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc85abc499c2694…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 13:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3f925a013be41dae8dc030dbad7f3ba3 SHA-1: ac0076f84bc712c0f791265d2f7d57c71f43d976 SHA-256: 5fc85abc499c2694f9036a25628c8c3bbd9281c56a1568874b48136ae5e08945
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, specifically targeting users with search-like queries. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/award?keyword=how+many+polar+bears+have+died+due+to+climate+change PDF link annotation
    • http://tomolijoponix.mypressonline.com/contract_law_textbooks_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489979/normal_60026ba0e20af.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/bose_cinemate_gs_series_ii_program_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/SQiFhdK/national_park_service_jobs_utah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381997/normal_5feca0ee78ca0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5ff240d816249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_600d56b158402.pdfIn PDF document text
    • https://cdn.sqhk.co/xorunase/ToijEYe/bedolatasusifirewinixu.pdfIn PDF document text
    • http://omynutural.space/budget_templates_freeii8lj.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/cirque_du_freak_book_series_reading_level.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimogovudefo.rf.gd/95622115929.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/when_to_grit.pdfIn PDF document text
    • http://zejagipusif.epizy.com/axis_direct_demat_closing_form.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/63562246473.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/movie_maker_camera.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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 5844 bytes
SHA-256: 4268a219cd5b0c6bf0a589344d58ba47f099036240537fe30b2c12e0b051172e
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10612 bytes
SHA-256: 2eb800519cbfcd76df8b3f1bebc19a6c2d22998fe89336c3b0175dd6fa24712c

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