Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6b71e1e546489b…

MALICIOUS

PDF

91.0 KB Created: 2021-03-31 22:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 13699a45fe3b13d146ec63b3a7c29cee SHA-1: 3b5a98f32c4d4e6cb26569ff4a91b8c682b63100 SHA-256: 1a6b71e1e546489b0e74a83f6904297e63383dc05ec6f951b2eb0deaf73151e8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as potentially malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for link farming, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=al+ghazali+biography+pdf PDF link annotation
    • http://jovepodixowofow.mygamesonline.org/39393080951.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/rgiharT/gezaxexuk.pdfIn PDF document text
    • http://pixxel.life/is_the_4.7_v8_magnum_a_good_enginefd46e.pdfIn PDF document text
    • http://wuvudazesog.22web.org/vazidanexemirekizom.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/Khcifib/zemegukawumewewazurara.pdfIn PDF document text
    • http://justiciaforjustice.com/8559962008kcu8e.pdfIn PDF document text
    • http://dlkmvkoenv.info/altar_server_training_clipart1mgei.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/cgYW3Kt/rixoketaxikesep.pdfIn PDF document text
    • http://cardioactiveuficiale.site/vozavamuvafuzizakq5i.pdfIn PDF document text
    • http://dotugigobeje.iblogger.org/manalimuraboxor.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/how_much_is_a_2015_chevy_silverado_worth.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/73499731440.pdfIn PDF document text
    • http://poopo.ru/what_age_is_diary_of_a_wimpy_kid_books_for5geik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_6011cf9e1e6db.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/hdjjshb/92076229344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_602719f552ef6.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/wewiro/boxing_games_for_psp_free.pdfIn PDF document text
    • http://riremeg.rf.gd/escape_room_level_48_answer_mystery_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/yasin_surah.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/soraxupaworuwekami.pdfIn PDF document text
    • http://kemesid.onlinewebshop.net/python_language_learning.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5404 bytes
SHA-256: 8d18a011db789f555fa9707c270391d99bffc4471765370650aa38eca0aa98f2
font_01_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 22728 bytes
SHA-256: 9e263d0fe02a2b0a7bff7089d107d68662bae2153982819ae46dab7b4d0ec4a4
font_02_sfnt_off00013e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E54 18836 bytes
SHA-256: 0e53bfe59c86beb186b6e2642ec723b1d8f31d2f2a396d8cb05a74012f5b4563

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