Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad89a828ded3a05…

MALICIOUS

PDF

80.2 KB Created: 2021-03-08 16:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8b33a2da27fd3c1bc4096fd0035b7880 SHA-1: b8b52fdf8b6b2c8dd9d59d6db3354c3f410a75cc SHA-256: 5ad89a828ded3a059a4be7b21ce8a100bbc496c30d9769fb4187f45b5df6bfb9
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure for a free PDF download, which is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8393

Heuristics 4

  • 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
  • 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=analytical+chemistry+by+g.+d+christian+pdf+free+download PDF link annotation
    • http://tonevagewalilu.medianewsonline.com/82711712218.pdfIn PDF document text
    • http://eslife.pro/62904979867yapdw.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/97897633530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fced64f349df.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/garmin_nuvi_3597_price.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/xirifebokakesajatimovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_5fd1593f13fb6.pdfIn PDF document text
    • http://didazema.mypressonline.com/what_is_a_landscape_social_studies_work.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_60461bfb89818.pdfIn PDF document text
    • http://futajef.medianewsonline.com/the_history_of_computer_programming_languages.pdfIn PDF document text
    • http://shoop-fn.ru/vishnu_sahasranama_stotram_in_kannada_free_downloadq2due.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/fundamentals_of_digital_logic_with_verilog_design_solution_manual.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/d1a3a7d9-044d-4298-9a6e-4ea27aea0618/39283504474.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/sandisk_clip_sport_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57d540f-bd99-423a-9495-0bf99cb05fb8/paxasonutevemolaxo.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_66cfef8eb23d47c4853af3bb69342096.pdf?index=trueIn PDF document text
    • http://kewetanetoza.atwebpages.com/all_american_921_canner_for_sale.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_8b26685f18214f748c2a55a82ef4147a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c883e8d2-4269-4eb5-9dba-347f2eafe3ca/no_fear_shakespeare_the_tempest_act_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4f0b52-6c71-4be8-8268-9717c6fd82f9/harmony_elite_reviews.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_181bfac6e75d4f0882b2064ae7176b71.pdf?index=trueIn 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_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 5924 bytes
SHA-256: b6a43334982f067f382290c38185fcf93d28dd94d60c4cecd1db8ec83db8ece4
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 16600 bytes
SHA-256: 13d46663ed2aef9c090c3cf81dc42d0d22f6810d195dfa1fe058f0af83b53f33