Malicious PDF — malware analysis report

Static analysis result for SHA-256 4619c5a6a1fcd760…

MALICIOUS

PDF

102.2 KB Created: 2021-04-05 12:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c8e635aff8de9bf59ac857b691a8a9ce SHA-1: d538d36f7bf3cb47fbf64083f0c144476035b544 SHA-256: 4619c5a6a1fcd7608484d6ac2421380fb3ed3076872aa4073e511da33fc88a1f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with the primary suspicious URL being https://jacksth.ru/award?keyword=tratamiento+cancer+de+tiroides+pdf, suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, appears to be related to the URL's keyword, reinforcing the deceptive nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=tratamiento+cancer+de+tiroides+pdf PDF link annotation
    • http://pojokup.getenjoyment.net/dagimumomitibalob.pdfIn PDF document text
    • https://cdn.sqhk.co/gananotez/gggjbic/28758016238.pdfIn PDF document text
    • http://vapurese.22web.org/candy_crush_soda_apk_pour_pc.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/jifagamuwum.pdfIn PDF document text
    • http://didekokeseg.iblogger.org/11569276493.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/ig3jeKK/wenamezipewojat.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/hblszif/business_relationship_manager_resume_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagapuxoxonigig.epizy.com/nikon_dslr_camera_ebay_uk.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_258bd37839ba4051bde15a44a8ad219e.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_a065238bb7b6417687066d23adc9581e.pdf?index=trueIn PDF document text
    • http://dokajita.rf.gd/wabisizojavuvem.pdfIn PDF document text
    • http://zazumevuf.epizy.com/vsepr_theory_in_detail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce667ad-bd34-44b9-acd6-f4f48402d02d/96020499580.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_9088df74d4924394bad97ce73e8a46c1.pdf?index=trueIn PDF document text
    • http://kedenutorufet.rf.gd/power_amplifier_design_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ef7c5c-b8e4-4342-aa6e-29199d8069a9/wogijanamivibojixujujoz.pdfIn PDF document text
    • http://gowatane.rf.gd/ielts_academic_reading_answers_of_hydrogen_cars.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
    • https://medlineplus.gov/spanish/thyroidcancer.htmlIn 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_off00015013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15013 5220 bytes
SHA-256: 772dad1cd9ace7e86156f2c4dcbd3cef70b4e109339456db1f6b554f5c9f0dcc
font_01_sfnt_off000161b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B9 12180 bytes
SHA-256: a2451835c7f041efb5c27a53d721cb04ec079c57db40625a46f171637b70caf6

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