Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65e94cd5255d0b2…

MALICIOUS

PDF

86.4 KB Created: 2021-03-30 02:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe6c7bafcf4ee46d866c7717c3e6f5c9 SHA-1: e614caee7ae275f23100acaf4b0e297688592105 SHA-256: c65e94cd5255d0b2c0da8d567b27feafcca5228f7d63e935b5616ec1bbd4df4e
74 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and a heuristic firing for a 'download button' lure. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm behavior suggest the document is designed to redirect users to malicious content or facilitate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=upkar+electrical+objective+book+pdf+free+download PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://world-wildshop.com/foundation_isaac_asimov2wz7o.pdfIn PDF document text
    • http://viwowiziboso.22web.org/18554359034.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/dumedosawipovu.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/86033563558.pdfIn PDF document text
    • http://insuranceautousa.com/how_do_i_reset_my_doro_70508r7uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/cjgejfb/interesting_facts_about_mary_did_you_know_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/hgihJhe/forgotten_carols_movie_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/c0nXtC5/tefaf.pdfIn PDF document text
    • http://meetcabinets.xyz/wukawifie96ec.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hb3jjSE/mivojoridujon.pdfIn PDF document text
    • http://mstmail.space/master_craft_world_crafting_gamesrjbm5.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/BMTghSi/nurorikosanuvero.pdfIn PDF document text
    • http://vofigasu.medianewsonline.com/74294768867.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://boxatofidomi.rf.gd/34214607923.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/torewadefewamit.pdfIn PDF document text
    • https://8458336b-24ff-4fe4-800f-81a5bbde53d5.filesusr.com/ugd/23a6c3_331b98b3b8bb4bbc8bbf9a9eb65c4602.pdf?index=trueIn PDF document text
    • http://faruvesisok.rf.gd/xokeroxafolopibudide.pdfIn PDF document text
    • http://zijapipote.rf.gd/the_richard_wyckoff_method_of_trading_and_investing_in_stocks_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7cbc6e-42b1-40d2-b509-586ed00ac08f/61977796900.pdfIn PDF document text
    • http://pakafadudu.epizy.com/gumefiwifemutakexolibape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ef3fb2-4f2f-4901-91f9-6b5d678ef654/16126982715.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/xelolajewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2f5d16-b876-496d-a553-c33ee67c1074/professional_growth_plan_ideas_for_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33068946-bd2a-4c2a-8539-d9ad83e46c96/which_of_these_statements_about_direct_insolvency_costs_is_not_true.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_10c389aea5a74efa852c89935f8b92bb.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 5396 bytes
SHA-256: 361a06b383556cab73bea99ccd6f312309bee8e1cee67b77fb62ae8024cb5b22
font_01_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 10848 bytes
SHA-256: 43e437dff10372647fae5ad91002ad17e15db8efa3626602fab81be6ff78bd79
font_03_sfnt_off0001314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 7784 bytes
SHA-256: cee458d9d36cfec7c1e4816a1b0d47720b41055479c8b820df75e4d93f9077f3

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