Malicious PDF — malware analysis report

Static analysis result for SHA-256 52326f944cf03c3f…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 10:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 578acfb70074ced039306836d6320b99 SHA-1: dafad032d00baca47f2b8b2d697381fa2b71b007 SHA-256: 52326f944cf03c3f386eee2eecfbfdc4f96f5a1c44ff94155cab07c28ba607e8
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains text related to 'edit scanned pdf documents online', which serves as a lure to encourage users to interact with the embedded links.

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://resalured.ru/award?keyword=edit+scanned+pdf+documents+online PDF link annotation
    • http://wemamenanimodi.22web.org/english_grammar_book_in_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474446/normal_5fc76ffd3660c.pdfIn PDF document text
    • http://milanomoda.site/lethal_weapon_3_filming_locations4jk02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fdbc1ee38f3a.pdfIn PDF document text
    • http://ranking-se.com/relative_dating_and_absolute_datingq5t8n.pdfIn PDF document text
    • http://dabobez.22web.org/can_procreate_make_vector_files.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fe2e216ef50f.pdfIn PDF document text
    • http://medtechnika1.ru/exercice_corrig_simplification_equation_logique76eqf.pdfIn PDF document text
    • http://titanovyi-filtr.ru/11030669815jui4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_5fd6735d218cc.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/geheje0/terranova_test_results_2020.pdfIn PDF document text
    • http://leree6.club/what_red_wine_goes_with_lambcve48.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/ibQUGgj/love_rosie_quotes.pdfIn PDF document text
    • http://busimaderule.mywebcommunity.org/what_is_aspects_of_human_growth_and_development.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezefaxovojole.atwebpages.com/academic_year_calendar_2020_19.pdfIn PDF document text
    • http://woximijik.rf.gd/corporate_social_responsibility_csr_is_quizlet.pdfIn PDF document text
    • http://tupusivamiguta.rf.gd/6204575642.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/debt_snowball_spreadsheet_example.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/website_templates_2019.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_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 5164 bytes
SHA-256: fb2dfe575c56d4952aa6bdc4e44e85d29251932cb9095d6c5924ce8fd4f47995
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10624 bytes
SHA-256: 4d8d84ebf6a6a64be66194387376a0b9df943340232dc040ae53ef8a94f3c5db

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