Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ade3660bf8f652…

MALICIOUS

PDF

82.1 KB Created: 2021-04-05 10:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0117fbb4783ce8f731db900c0254b020 SHA-1: 49ce8357ef9809a7f8ea6b98fe956f18107dd462 SHA-256: 41ade3660bf8f6529f01bba69c4c3d6f4deffa927c1306052994cb9d9b36b5ed
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a primary focus on directing users to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://soxebez.ru/award?keyword=mathematical+critical+thinking+pdf PDF link annotation
    • https://cdn.sqhk.co/zepaginu/T3hfEjd/94910506618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389384/normal_5fe138dac5c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_600e4100e80cb.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/jdIBzSQ/collect_coins_in_featured_creative_islands_codes.pdfIn PDF document text
    • http://rojemokigir.iblogger.org/nituvinuruve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ff65515a060d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603f1f2801463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fcdc50658306.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/V1ibWqB/70258505431.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/8jewBgc/56785273322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_ca281404bf4a4d71aac779983182c755.pdf?index=trueIn PDF document text
    • http://fanuzisi.epizy.com/oceanofpdf_site_down.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_072982be62d742198257556a1cf478f7.pdf?index=trueIn PDF document text
    • http://jatuvudusu.epizy.com/answer_sheet_50.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64e77c8-cad5-43c6-9ab8-80d1d1f0f3b6/the_stanley_hotel_colorado_ghost_tour.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_ed0034bd0c7a4fc8acada4a56a3e2d90.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_34585a56a8bf41bab1bbe278209a91d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f47e5c-5da9-4513-bf79-82e51e054596/how_to_fix_tablet_charger_port.pdfIn PDF document text
    • http://kibeloveze.rf.gd/bouvier_s_law_dictionary_1st_edition.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_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 5460 bytes
SHA-256: 66a6ffb39f5b57e0685bebe746eb9324bf13da43ade42553037eaf6f613e4e06
font_01_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 10872 bytes
SHA-256: cd9208762579cdf0093c14d1ba620eb78b9e38a6fa56eb4cfe83d0ac386fe516

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