Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4252ec9ad5cf7b…

MALICIOUS

PDF

99.6 KB Created: 2021-04-18 08:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cfc0639cdc60b83da86118a5754df472 SHA-1: 4a21e3d3c86277c3b1897c04e17203cfc8570b9b SHA-256: be4252ec9ad5cf7bd98d0b02582d27fe4678210c1f1e8ed480b13d2a15c6c064
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain (`mezovuduw.ru`) associated with phishing or malware distribution. The PDF's structure suggests it functions as a link farm, attempting to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=kobalt+dual+bevel+miter+saw+blade+change PDF link annotation
    • https://cdn.sqhk.co/parikozug/gijcS0c/rebel_inc_escalation_guide.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/bearing_stress_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/ijdYCXx/mokonusurof.pdfIn PDF document text
    • https://cdn.sqhk.co/lululitoj/NnficgA/origami_star_paper_strips_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/ninevowa/iiT4Tgg/battery_management_system_for_electric_vehicle.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/5KicLih/jumpstart_world_gameplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/52516033827.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/zabezudupatotukefer.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_c98a1b6f78344505b331047b2236d7d2.pdf?index=trueIn PDF document text
    • http://lumijezemoto.rf.gd/clasificacion_de_las_empresas_segun_su_naturaleza_juridica.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_1fb3804d37e046e89688b2ff050b9b84.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b317f6caa27544e992e8a5149e562687.pdf?index=trueIn PDF document text
    • http://xuxusemo.epizy.com/luwomagedinipepafenupugej.pdfIn PDF document text
    • http://noxetowukamav.epizy.com/sample_math_aptitude_test_questions_and_answers.pdfIn PDF document text
    • http://favilogas.rf.gd/suzewupelevitaze.pdfIn PDF document text
    • https://8bbfbdb8-1895-4472-a1c6-9e834ce25a60.filesusr.com/ugd/7deb27_af9a60ceedb549999320e218c279fa31.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_e56762836a87492cb0eabdc35faae95a.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_334ecdf852724befa8607b92f91bd676.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_3f6512e091374ae3827ef4f4e8391bbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/14023496691.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/louisville_basketball_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/august_osage_county_play_character_breakdown.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_off0001441c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441C 5616 bytes
SHA-256: 634a9e194e4ef29541051f4fa7aa3411223cde13fb782e6cf0f9cf48229c6fc4
font_01_sfnt_off00015720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15720 12440 bytes
SHA-256: ebf23f23cf6292e9cc0c642457b05fbc72bd55f92df706bfec167ef1bbc0f4a2

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