Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bb122e991a188e…

MALICIOUS

PDF

73.1 KB Created: 2021-03-17 01:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4faaabfa7a3f077bcb6b355d6362885 SHA-1: 268f1fd2cb2515fb8e8451fec95944b16775baf1 SHA-256: b9bb122e991a188e4418cc0ec10f51b8f6f0704b0a71422201372e61f0815f91
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to malicious sites, specifically masquerading as 'language leader coursebook answers'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/123?utm_term=language+leader+coursebook+answers PDF link annotation
    • https://cdn.sqhk.co/lasetipulos/Lifijig/financial_reports_of_companies_in_pakistan.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/xejodakuvosegalaveboruk.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/jgiahdd/74292492874.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/bic9rgg/barujik.pdfIn PDF document text
    • http://vatojaginasi.22web.org/super_mario_sunshine_walkthrough_100.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/asjbgdd/skyrim_served_cold_without_killing.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/jjMZngc/beach_buggy_racing_2_ps4.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/raleridex.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/26132446012.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/79633010587.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/descriptive_research_ebook.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/what_is_the_correct_order_to_watch_the_marvel_films_in.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/does_walgreens_sell_jumper_cables.pdfIn PDF document text
    • http://pagexonani.iblogger.org/durga_saptashati_marathi_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girofili.myartsonline.com/galanapama.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_a63bb6c0b78d4cd485fcee6c1fc3c850.pdf?index=trueIn PDF document text
    • http://tekunobujolid.epizy.com/pdf_search_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92a2e48-6583-4ba2-b855-cbe0b754a14f/vatujijevovagosefix.pdfIn PDF document text
    • http://xogeguf.rf.gd/tableau_server_activation_key_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125238f2-c884-4dd0-aad8-f63f77b48866/bowelededose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91cd02c2-d232-405c-8e01-7435a5ffb66d/how_to_make_a_1.16_minecraft_server.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f397e4a9-388a-4515-82c0-8d56e9ffd65e/marsha_linehan_dbt_handouts.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_5b3a8af1414e4da29ec05130c03d01cb.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_fc8527774d604b4aa65991970f0a4904.pdf?index=trueIn PDF document text
    • http://wosezime.epizy.com/26542130032.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 5344 bytes
SHA-256: 2b098e0bf0c9aead886863df20c9862e46b148370b88bb71d883f38205f6132a
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 12760 bytes
SHA-256: 6c488f362e2678ad994b8023ea797d2b25a89dba6249916b5d12206c41ceb6d7