Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c41c6d66753a737…

MALICIOUS

PDF

77.5 KB Created: 2021-04-15 16:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e4b63f54b4f430884e929f932afadffa SHA-1: def65c9ad5961ce6a675fdcb089438ce4bc7cf81 SHA-256: 4c41c6d66753a737c50427b560d078fd4e28ede57634930e6b7ee82a14a87fc6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a product review, directing users to a suspicious URL.

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://dugedepap.ru/strik?utm_term=which+citizen+eco+drive+watch+is+best PDF link annotation
    • https://cdn.sqhk.co/rasetiwulipu/ihchhhj/manchester_by_the_sea_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_605ef9d3667a5.pdfIn PDF document text
    • http://fragcups.com/wallpaper_liverpool_fceyxnv.pdfIn PDF document text
    • http://nudistoff.club/what_is_the_code_for_a_cisco_cable_boxwmk3m.pdfIn PDF document text
    • http://vivadoctor.ru/34047196598jg2rd.pdfIn PDF document text
    • http://yazansoft.com/juzipoxesazaji8qo4e.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/96960495178.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/pengertian_model_addie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391319/normal_600216400a9cf.pdfIn PDF document text
    • http://reduslim-siteofficial.site/comparing_two_excel_sheets_vlookup8ezji.pdfIn PDF document text
    • http://magnifioco.site/4272279696g0cpp.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/ialMuJc/ai_sound_words_worksheet.pdfIn PDF document text
    • http://wordwild-store.com/pablo_neruda_cien_poemas_de_amor_y_una_cancion_desesperadamiiou.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/yjbggjg/46602318321.pdfIn PDF document text
    • http://rusakova.space/on_the_road_again_gif_shrekfczfs.pdfIn PDF document text
    • http://blockhcain.host/dewalt_7_1_4_circular_saw_cordless_60vrrrba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_6018542f28fd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_ad805825369d4a57835e44cb84c5fb0e.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_6d5ed612ff334d4884d5029e0667bf7c.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_f8a5a93ddd2844c1b5ec837bf0cf0674.pdf?index=trueIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_3c5c6aad21004389b451017aa4e0e60f.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_febeee5fc6bd422aaacda3527866904f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 5352 bytes
SHA-256: 28f403c51207ac39144dd2240a24910234c1de4f167cd1d5f52c9b3860e2403e
font_01_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 11060 bytes
SHA-256: d081c039b19e2d1d64afa8286424e1ae42916786fdcd5b44f8a7c470996e9fc1

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