Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f1335929fbf764…

MALICIOUS

PDF

132.1 KB Created: 2021-04-07 01:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 28e0ae388776d79536150a09318194e2 SHA-1: ca9ec2a96b6c9229cade38c074a9780105abf51f SHA-256: e6f1335929fbf76475dc6e552be54cbb5195ecec096fac907d6f0c824da02315
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 pointing to disposable hosting, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to academic materials, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/award?keyword=atkins+physical+chemistry+pdf+archive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5fe607a6b0b13.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/marketing_of_banking_services_books.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/idEwheK/31892113338.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/50328711708.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/jdpojhD/cad_viewer-_dwg_fastview_pro_apk.pdfIn PDF document text
    • http://vrestoran.info/foxtel_espn_sports_tv_guidem6mjq.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/85571404616.pdfIn PDF document text
    • http://meetcabinets.xyz/29869233608qb9lc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_603d4ca73f3ce.pdfIn PDF document text
    • http://glasshookahcatering.com/52665226136e5j1j.pdfIn PDF document text
    • https://cdn.sqhk.co/nuponoviva/I4haJij/gowenugamamu.pdfIn PDF document text
    • https://cdn.sqhk.co/disemelukap/hehdigm/knife_fruit_cut_master.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/gimisorixosu/80610726609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79955a91-14a3-446e-8d88-744eac5432e6/how_to_clean_powerforce_helix.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/63315720820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c63d5b6-3cc6-4cef-bb37-daa9adeda77f/present_simple_exercises_with_answers_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059de208-9444-48d1-9cd2-0c0c49422616/military_alphabet_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7117dfbe-455c-458e-b62b-2f3a2f358b52/what_is_strict_constructionist.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/depomasozawizufipazuwirix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6c06ab-6e21-4be3-9075-5bf453cf6458/57374612377.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/bissell_powerforce_helix_vacuum_cleaner_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/65680060217.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C9 5608 bytes
SHA-256: c1dfcc2d0ca22a3c38c024c5efe501c488e4632c4491d60b3192e4d8f79ba3f9
font_01_sfnt_off0001c3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3CA 12116 bytes
SHA-256: 47d75bcd13935d8668d0dc82b00dc81b4d5bfacae2d57f3f8ead249639b5d666
font_02_sfnt_off0001ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECE3 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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