Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f4b7e3905f83a4…

MALICIOUS

PDF

75.4 KB Created: 2021-05-15 20:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8d5af4a65db24943e7e5f26c0eaac398 SHA-1: ebd56b07534c72aeb6752aa8f71bb4f8a7264a94 SHA-256: 98f4b7e3905f83a4c451de06e26a9947de385349b00f7baa81b71d0d106f219a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. 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 search terms, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=gluten+free+breakfast+ideas+fast+food PDF link annotation
    • http://qwertyujg.xyz/657481879450ifoh.pdfIn PDF document text
    • http://fsbsiod.com/analise_financeira_de_balanos9ukhy.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/ha1iijh/80018928299.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/segals_solutions_shampoo_review.pdfIn PDF document text
    • http://vir-tus.com/open_syllable_worksheets_1st_gradebmjsb.pdfIn PDF document text
    • http://fimewot.xyz/best_option_trading_strategies_for_indian_market_book9cwo8.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/dgdhe7e/71467629482.pdfIn PDF document text
    • http://mitipevebedo.iblogger.org/apsacs_date_sheet_2019.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/payment_request_letter_format.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/gE0dkIQ/xefatelalodulugefiwerur.pdfIn PDF document text
    • http://biggymstoe.com/candle_light_dinner_new_punjabi_songez6ce.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/dnjhidi/vintage_soul_boutique.pdfIn PDF document text
    • http://buylettersonline.com/what_are_the_top_rated_movies_on_netflix_right_now5d65i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soranodabiwegi.myartsonline.com/mysore_wodeyar_history_in_kannada.pdfIn PDF document text
    • http://noboxiroxe.epizy.com/fourier_series.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/how_to_sell_books_for_dummies.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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 5136 bytes
SHA-256: 51b1868e31dfa004a4cb44b2e21fe6749c9c199d933dac0bf1e31024d2d7e3ba
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 11184 bytes
SHA-256: 5875df769530fcb837d35d937e4fcd5ae4f71e8e9066a62337c4cc04fd5b8abe

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