Malicious PDF — malware analysis report

Static analysis result for SHA-256 b618400c142ec69a…

MALICIOUS

PDF

81.8 KB Created: 2021-04-02 09:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c57a334eaf0d5f230367ebf721bc044 SHA-1: dd561a062eabc13c4e8aa92249fbbecae9a447cc SHA-256: b618400c142ec69a3248cd708162018fa9e2bd42065e9b3e7394353b2593984d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/strik?utm_term=what+is+reference+upon+request PDF link annotation
    • http://vifijes.22web.org/rawajemebowugug.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/JjiMhji/59399059520.pdfIn PDF document text
    • http://imkl-checker.com/kenmore_300_water_softener_recharge_now8sya3.pdfIn PDF document text
    • http://tekplafond.xyz/how_to_install_insinkerator_evolution_spacesavercbabg.pdfIn PDF document text
    • http://usecabinets.xyz/fitetodusefuwrnkmq.pdfIn PDF document text
    • http://closemaze.com/toketupixojuecegx.pdfIn PDF document text
    • http://zepofevof.22web.org/suwosenopebadimizuvo.pdfIn PDF document text
    • http://cybety.xyz/rexesugujikawoxuripansrkjt.pdfIn PDF document text
    • http://bizbize-yeteriz.org/best_sellers_books_2020_ukj6ni8.pdfIn PDF document text
    • http://hellesypakk.online/45853938742zda0i.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/hcgeDzs/mini_block_craft_3d_game_download.pdfIn PDF document text
    • http://omynutural.space/how_to_change_the_battery_on_a_thermostatojier.pdfIn PDF document text
    • http://kokogasuwesoge.22web.org/17051973332.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/susimoruvaxew.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/hC9dhf2/shell_clubsmart_kartennummer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_64afca68514e40649970caccae30b0b3.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_9c6ceb159a5d45a8b497c9f4c66e4590.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_cf4826c6bc314ab99b75faeed3e2b9e2.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_76a7d7c5ab7d4e14a77c041d3c979f15.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_d5e1f54d0d1245c18c034b3e9c13894a.pdf?index=trueIn PDF document text
    • http://memamawu.onlinewebshop.net/67227480483.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_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 5212 bytes
SHA-256: eec70de210f27d8dc800b991aa3a4b660edde2fe2accd454a8878995918cd85b
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 11756 bytes
SHA-256: c086f7b42aa19065df6ac9dd1f8ce2f6a952c6432575b09564d14229b74bb3db

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