Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac0ad15303b7cad…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 10:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fa8444edddc2119f1cb34c15811cae25 SHA-1: 0a5c08fbba6d832eb829f9a7ad7f966f1f212dab SHA-256: 4ac0ad15303b7cad252cd936a0b2e4409a6e6bebb6a3ad89cd1766618b873fd9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and embedded links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'mathematical notation book pdf' and application metadata, likely serving as a lure.

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://midufefew.ru/award?keyword=mathematical+notation+book+pdf PDF link annotation
    • http://nafarami.medianewsonline.com/who_supported_johnsons_reconstruction_plan.pdfIn PDF document text
    • http://cetapp.xyz/gigabyte_gtx_970_windforce_oc_specs6e1fi.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/jjajjTz/wwe_2k15_accelerator_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/hWnege9/wallpaper_free_download_for_desktop_windows_7.pdfIn PDF document text
    • http://defi-bet.world/harry_potter_and_the_half_blood_prince_chapter_summary4i7ur.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/jawifizufilusurefovuj.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/jidjcjj/95011661590.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/zularagajizefidaxa.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/gekixadonuru/t_maxx_2.5_review.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_53e1eba7c15d4e949a8fa9f8c432cd9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0653d4fe-26aa-4ba2-95ba-8ad3d5d34a1a/grade_11_physics_textbook_pearson.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/6706390605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6190220b-e63f-41e3-aba3-d9acd47407cc/5th_grade_worksheets.pdfIn PDF document text
    • http://novupomajanox.atwebpages.com/rejurit.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_87404719094348159d66f424bd5f1c94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8deedebf-748b-4b81-8952-26aa4d31de12/30253948142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95f265c-a3b8-44fa-99d3-0dbd02ea0cfb/97895879175.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_79d3757bb22349e1a3b7f13205bbf2ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66196eed-41db-42a3-9678-4576cecd979b/how_to_unmarry_sct_livewire_ts.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_c154f6fdbdfb48149c6960d8fa5f4254.pdf?index=trueIn 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_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 5332 bytes
SHA-256: f0418179d09154085c483ee980c691428fd53e2540d9af48157500c0175f8a58
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 10716 bytes
SHA-256: 7f6f87719a06c9061ce2aa843a1e6e373b55a6876cc06f4dce24e5de1609cea5

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