Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33dd473e2daec3c…

MALICIOUS

PDF

119.2 KB Created: 2021-03-19 23:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9054f165ec283b4072bb8db4911d02e6 SHA-1: dd49ce50e8fb0f0a23b88cd6fd7c08beffb38d82 SHA-256: d33dd473e2daec3cd1d6e1fc9548bbcecc531721b6013c02d9194d37643a53d6
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a ClamAV detection name indicating it's a Pdf.Phishing.Trojan. The presence of an external URI pointing to 'jacksth.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=intex+krystal+clear+saltwater+system+and+ozone+filter+manual
    • https://static.s123-cdn-static.com/uploads/4473903/normal_5fe257881b67c.pdf
    • http://kernig.pro/inference_worksheet_middle_school1e199.pdf
    • https://static.s123-cdn-static.com/uploads/4425916/normal_5fcbf00a16641.pdf
    • https://cdn-cms.f-static.net/uploads/4374715/normal_602f794d407d9.pdf
    • http://azalea.store/dosigixamagarime7ozj0.pdf
    • http://futiwakeso.22web.org/19793149882.pdf
    • http://bestunew.xyz/que_es_la_educacion_segun_autores_recienteszmsq1.pdf
    • http://outputqwvk.space/16366221823z5kuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39e53ca2-9e5d-4794-a36d-436a5b71a859/what_is_tidal_power_advantages_and_disadvantages.pdf
    • https://uploads.strikinglycdn.com/files/af82461a-2f71-4b42-96a2-a11a1bfdf473/what_is_the_minimum_pages_for_a_childrens_book.pdf
    • https://s3.amazonaws.com/baxekojojexusol/81052745789.pdf
    • http://lofoxos.epizy.com/vobov.pdf
    • https://uploads.strikinglycdn.com/files/e9941b0a-1c6c-4522-8c83-bbe501d8350d/46538303553.pdf
    • https://uploads.strikinglycdn.com/files/2aa9a095-0c66-42fe-8db6-cf94528fe683/6225880497.pdf
    • https://uploads.strikinglycdn.com/files/96b87fdf-212e-4c6e-bd0f-cff54c3b435f/the_crying_game_movie_analysis.pdf
    • https://s3.amazonaws.com/wetowuzuxit/63238377043.pdf
    • https://s3.amazonaws.com/fizufapu/95256150584.pdf
    • http://ropigitapeda.rf.gd/anoka_county_sheriff_accident_reports.pdf
    • http://vegawududabuz.rf.gd/chemistry_revision_notes_form_2.pdf
    • http://tabikobi.epizy.com/vehicle_dynamics_theory_and_application_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001923e.bin
400c0fbbb9c1f61eeaf2683f841d39001317537e20f42878b3de1b02eea13b93
pdf-font-stream PDF embedded font (sfnt) at offset 0x1923E 5480 bytes
font_01_sfnt_off0001a4f8.bin
988572d0004a3635a7ff73e1e109aaba2ce7e8ea42362d85234e9e71cf6ddf1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F8 12180 bytes