Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d295d351a9d750…

MALICIOUS

PDF

71.3 KB Created: 2021-05-14 21:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d9afe7d09d6be60843b5ea7f2517aad5 SHA-1: 71d37ead97fa347cf55eb6558faf4c5c98c1b449 SHA-256: 58d295d351a9d750c133bc9183999833d292fdd178497c4df93467fc03875c63
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://leonvi.ru/strik?utm_term=what+is+a+child+in+the+bible PDF link annotation
    • http://wuroguredogir.getenjoyment.net/which_is_not_a_characteristic_of_the_culture_of_ancient_greece.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuruba/ig5hcXN/ltlt_pasteurization.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_606743bd60318.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Mgg66hi/bubble_pop_game_free_online_games.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/78907860356.pdfIn PDF document text
    • https://cdn.sqhk.co/zavipudajose/c7gd0n8/11505002620.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/fordham_law_class_schedule.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/eurydice_play_script_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_6031015b1d197.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/jetghup/joximemuwojed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_60588966ab5de.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/topoganosifoximufobisoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/tesuvifiv/Jjehgjc/94452549074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_6048d1a7b9e0d.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/jgjhiaJ/black_friday_sales_at_walmart_this_week.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/carbon_steel_material_properties.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/bkgfhd6/new_ultimate_free_vpn_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ximosufi/jiESyhb/manualidades_para_nios_1_2_aos.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/ropidadegaxut/vakoper.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/contraceptive_pill_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/ravak.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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 5084 bytes
SHA-256: 5ae2ce421f1437ba0fe2f069ea82db19ca7c95fb0867b8dc0202f0e9e346d78f
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 11104 bytes
SHA-256: 5e3e0a36dad198d097798990a8e41445293fedf9728adf1722914ddec8680c12

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