Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ae7598a8c6a1b6…

MALICIOUS

PDF

70.0 KB Created: 2021-03-25 11:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 18d7c5e7f37c0fd088f597e0b2103f5a SHA-1: 9de782d88d497fdb5a7496b990d01d25cc86c9e0 SHA-256: 51ae7598a8c6a1b6b143fc261476990916c928e1f269052cf57a664cbf474484
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing lures ('jacksth.ru'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=happy+birthday+ukulele+chords+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5fd03cff65129.pdfIn PDF document text
    • http://fastpysystem.online/changing_the_subject_fallacyuupb8.pdfIn PDF document text
    • http://begdas.fun/kimibagevozopevut18cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444647/normal_601b87b2b4efc.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/CgciUXU/movie_premieres_2020_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_60102a6b33f45.pdfIn PDF document text
    • http://securityverifiedservices.com/35847910325l67d9.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/w4mifOq/83177943670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_6010562b21ce1.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/faragig.pdfIn PDF document text
    • http://supportcopyright.net/tcp_ip_application_layer_http9nrj7.pdfIn PDF document text
    • http://geniputan.66ghz.com/foxodimamonif.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/jh07wAe/12592851439.pdfIn PDF document text
    • http://amsidisi.xyz/answer_to_complaint_sample_philippines01uxh.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/titugome/old_school_runescape_blackjack_guide.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/clases_de_sistemas_operativos_para_moviles.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/death_by_a_thousand_cuts_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/dabipotifipuru.pdfIn PDF document text
    • http://dabesajunelazul.rf.gd/dogidavemepatizavevosopi.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/sample_company_letterhead_format.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/how_do_i_tell_what_year_my_briggs_and_stratton_engine_is.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/lopalakokuzewiposepomu.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/the_cabin_in_the_woods_the_official_movie_novelization.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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 5512 bytes
SHA-256: e48ba6dd46515789b6f7f4f16d6abee1ec375c01ada5b313c0bdbf835ab69fe3
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 10760 bytes
SHA-256: 4bd6157ec1437ac19d99ede1e962f24076fa0bb15ff91e510ce8ea0636c76b6f

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