Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38504401ec6649e…

MALICIOUS

PDF

83.8 KB Created: 2021-03-22 00:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a8ec5aa55aa3f3efacc8c9391299344 SHA-1: edba1748fbeeac98f575ef8ddc635b9be07e4419 SHA-256: c38504401ec6649e1d85112ef4fbf28fc76224f745d5c61c18b1cc6ccb40bc97
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The document body, though heavily obfuscated, contains text related to zodiac signs and astrology, which is likely a lure to direct users to the linked websites. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards a potential phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=zodiac+signs+and+astrology+signs+meanings+and+characteristics+pdf
    • https://cdn.sqhk.co/jenuluvonuz/hi7idji/simplehuman_mirror_light_wont_turn_on.pdf
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5febb4440c523.pdf
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5feaf277eca0c.pdf
    • https://cdn.sqhk.co/sepokafaru/vAyhghg/get_followers_tags_instagram.pdf
    • https://cdn.sqhk.co/toliximozupa/ha0jegf/direzelinanuxutijanomow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wowutuzineko.myartsonline.com/84594472482.pdf
    • https://s3.amazonaws.com/fomaralunex/audit_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/voropa/android_games_like_diablo_offline.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_4883b45edb5d4e37a894a4e3ca4e1b78.pdf?index=true
    • http://bumurulepowele.myartsonline.com/18607695509.pdf
    • https://s3.amazonaws.com/wiremeresegikon/fevonudamifu.pdf
    • https://s3.amazonaws.com/kulinisokakewi/4261096171.pdf
    • http://gakilasefit.myartsonline.com/holmes_tower_quartz_heater_with_max_flow.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/what_is_the_starting_salary_of_indian_air_force.pdf
    • https://s3.amazonaws.com/wizuluworafid/80060263992.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_ce0c0a01eb8e4eb98a5742cb543f8f37.pdf?index=true
    • https://s3.amazonaws.com/jidosatikim/available_apps_for_android_auto.pdf
    • https://s3.amazonaws.com/tufitijinexu/atmospheric_layers.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a9.bin
2df7a465dc776d4bb38fccca4549813ed9f8eeb238f85f4c3a94831f687f8e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 5628 bytes
font_01_sfnt_off000106ab.bin
b190a967ce8ba1b94f8c8cfc3a04cdb06b338f1c1b68188470a62b881f3c1ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 11060 bytes
font_02_sfnt_off00012b8c.bin
21d2c517cc0d2781f643886744ab2248bbe8d92ed1ab736cc2ad748918d5c6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 16296 bytes

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