Malicious PDF — malware analysis report

Static analysis result for SHA-256 331135de4ae1fafb…

MALICIOUS

PDF

71.1 KB Created: 2021-03-30 16:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b59b293ef97ab38a7dc8d332d15e37c9 SHA-1: b3d2f18d16baf11142d308674aff6de829d4ea9d SHA-256: 331135de4ae1fafba6d8ac901ea19aa54534884429ed5def00a939948c3b0a68
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=applied+maths+notes+pdf PDF link annotation
    • http://giwepaz.iblogger.org/61318129571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_603e803ce3ba8.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/ghlhfie/fc_bayern_munich_old_stadium.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/1989_vw_cabriolet_service_manual.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/naduzolituzuvajojip.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/84401980612.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/aShiib1/34570539145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_6052fdac2a468.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/NjjqjiH/word_family_books.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/rif09Dq/chikungunya_symptoms_in_babies.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/right_concentration_a_practical_guide_to_the_jhanas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molutuganum.epizy.com/fossilization_process_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab13828-0223-454f-81e1-23897eea48a7/resumen_sobre_el_libro_de_los_abrazos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d96421e-5270-41b8-8a12-138cb5d0cf5d/game_rulebook_template.pdfIn PDF document text
    • http://gerutinikokowa.epizy.com/anabolismo_y_catabolismo.pdfIn PDF document text
    • http://wavedada.epizy.com/xoladewekuf.pdfIn PDF document text
    • http://burisaxaz.rf.gd/saxon_algebra_1_online_textbook.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/g_shock_rangeman_gpr_b1000_strap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1593507b-4e60-43fb-ab9f-554a2dff3665/snapper_mowers_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d1341e-6829-4759-bdf6-be9658e8958b/multiple_streams_framework_example.pdfIn PDF document text
    • http://pogapebod.rf.gd/embedded_video_from_website_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4b8efd-a9bf-4282-8c05-596c62338825/lord_of_the_rings_book_review_common_sense_media.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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 5176 bytes
SHA-256: 15c5bc5c8840dcf157e458d39c758007ef8b6f7a98c5fe91956d143c2cd7e604
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 10100 bytes
SHA-256: 8b241bd834da357c8bfcc572f109b2532ef1c53d441359b512e9161cf562fe8a

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