Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbd5d937d8b285e…

MALICIOUS

PDF

87.1 KB Created: 2021-04-17 17:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f16c4c4271397483efa109754049d298 SHA-1: 7c4d093caee3783b11e6105e7bb48642a72d724b SHA-256: 4bbd5d937d8b285eab427a05ac1f5b2c27906c4b5248f2a5fe8f9787e1f05a64
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a search query, suggesting a pretext for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=98+honda+accord+maintenance+required+light PDF link annotation
    • http://zadumagasuzek.22web.org/kpss_vatandalk_ders_notlar_benim_hocam.pdfIn PDF document text
    • http://silvanozito.online/50808668604wgl27.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/62639317736.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/73069173018.pdfIn PDF document text
    • http://kevufeduwatawos.mypressonline.com/kotodusa.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/list_of_appropriate_preposition_with_bangla_meaning.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/breasted_history_of_egypt.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/8427701944.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • http://cafechorsu.ru/bohemian_rhapsody_sheet_music_for_trumpett0tfp.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/best_free_reader_editor_for_windows_10.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/assurance_and_insurance.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/xopipizosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dfd7c4-fda7-40e2-b186-89918f3fd322/best_choose_your_own_adventure_books_6_year_olds.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/33150940998.pdfIn PDF document text
    • http://vutifuluviti.epizy.com/descriptive_data_analysis_in_qualitative_research.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/define_selective_incapacitation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141f7852-d768-4340-89a9-e0116c3eabd1/big_green_egg_prices_at_ace_hardware.pdfIn PDF document text
    • http://diwedixeku.rf.gd/46956781299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2edb12-e401-405f-a6c5-3da457c79a61/40980404447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910b3253-5240-4e9f-a638-b841be8cac6d/business_analytics_courses_edx.pdfIn PDF document text
    • http://suwedafi.epizy.com/36932943361.pdfIn PDF document text
    • http://jaledab.epizy.com/fokajizupowazokep.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_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 5556 bytes
SHA-256: e276e8d06c4acc16e1e3724f24f8f53d56d5c417e30006bd55f3673ca57b245a
font_01_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 11696 bytes
SHA-256: d064b6a0254e1265c8ec3ff1ead08825417de57c5f6026e7df9263f205752c77

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