Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7a8e6f7ea9fec7…

MALICIOUS

PDF

73.9 KB Created: 2021-04-04 07:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a0632a37dd6f6b008e0a05de8a92ccf SHA-1: c939cb51319348600fb5eb5358796e35fe7cdf16 SHA-256: 6c7a8e6f7ea9fec7f5e005ac719f16c1b3e7397f8e58e75943d1d120dbfd51be
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=astm+a182+pdf+free+download
    • http://xamawigokoke.mygamesonline.org/is_a_declaration_of_trust_valid_after_marriage.pdf
    • https://cdn.sqhk.co/dasekizob/1iFFtNC/catfishing_rigs_for_channel_catfish.pdf
    • http://vikarevu.22web.org/bed_sheet_standard_measurements.pdf
    • http://sewukagazub.mypressonline.com/riwemalatagejenijukekur.pdf
    • https://cdn.sqhk.co/dixejetafap/tihjhjM/nfl_sunday_ticket_promo_code_barstool.pdf
    • http://veselutut.mywebcommunity.org/what_happened_between_1700_and_1800.pdf
    • http://vadanunagirira.getenjoyment.net/pedovikavizimufode.pdf
    • https://cdn.sqhk.co/gatezoru/jdiehNl/pirate_king_facebook_hack_fb.pdf
    • http://devumixik.iblogger.org/89442842877.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_332edb3fd68b4e46a873cdbb940c56b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba65af33-b072-49d0-9e93-cc445798e4cb/60823005651.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_a4ab4701bdac403d868170a658f070db.pdf?index=true
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_1016c57a1e8f4a2093525f019fae7924.pdf?index=true
    • http://vimiromomekex.epizy.com/53743828688.pdf
    • https://uploads.strikinglycdn.com/files/63d3fcbc-f430-483d-ad03-82cf920748be/52077713193.pdf
    • http://mojelol.epizy.com/factorytalk_view_point.pdf
    • https://uploads.strikinglycdn.com/files/e4d2585e-8113-4655-accb-25bbf1a32d8e/what_fruits_are_low_fodmap.pdf
    • http://rumudawe.epizy.com/pelodugarabuvafoku.pdf
    • http://fonedasin.epizy.com/gixezujadikorimuwogasaxom.pdf
    • https://uploads.strikinglycdn.com/files/d0541a3a-4bc5-4dee-9f6d-8d36c42e8e5d/21201117382.pdf
    • http://beperedusewigu.epizy.com/rental_agreement_stamp_paper.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_5146b7144e844931810c54c619105394.pdf?index=true
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_78ca415e181d4620a8855a1a93207712.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa3.bin
73034fc25a2bb65a4a06d7567a852329a0869cba7f3d9d152266f999f5231753		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 5648 bytes
font_01_sfnt_off0000f2de.bin
b818db12946cf1ee2b86edace2b25c9e2949b2a46dbbfebc01a2992b6cb9b9c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 11628 bytes

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