Malicious PDF — malware analysis report

Static analysis result for SHA-256 d893f5c3f3d4fe60…

MALICIOUS

PDF

101.5 KB Created: 2021-03-25 05:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec3e0926a010a37e37c9f29c95ff464d SHA-1: 2e2210d85c78caec272c81b5fba1b7a89128f838 SHA-256: d893f5c3f3d4fe609c17478e557dabd5a000f33f5f34e7adec611385add765d8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL `https://resalured.ru/strik?utm_term=racial+state+definition` is identified as an external URI. The document body, though heavily obfuscated, suggests a lure related to 'Racial state definition'. The presence of multiple external links and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=racial+state+definition PDF link annotation
    • http://tokesuditetu.getenjoyment.net/delta_table_saw_fence_upgrade.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/86715338576.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/dasogozazikopiv.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/npm_command_not_found_windows.pdfIn PDF document text
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/6824123.pdfIn PDF document text
    • https://wajadotufa.weebly.com/uploads/1/3/1/8/131857144/8684500.pdfIn PDF document text
    • https://pimiwunuxijekez.weebly.com/uploads/1/3/2/7/132741089/tifudalim-wabawak.pdfIn PDF document text
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/semig_gituxo.pdfIn PDF document text
    • http://dusosax.66ghz.com/child_care_subsidy_guidelines_ontario.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_7285bcd6917e4baa85715481106f6389.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/how_to_use_cricut_expression_2_without_craft_room.pdfIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_5650fda33cf84e29aa1f16d5be7c39e3.pdf?index=trueIn PDF document text
    • http://pavemamixazose.rf.gd/transgenic_plants_bt_cotton.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/answer_sheet_scanning_software.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_913a4d1758cc44beaf1cdf0cfd48e884.pdf?index=trueIn PDF document text
    • http://felugibesixe.onlinewebshop.net/hp_deskjet_5550_change_ink_cartridge.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_0cc64982001349b485e57d0ac1bf9f12.pdf?index=trueIn PDF document text
    • http://lijowavatajo.myartsonline.com/vifesebad.pdfIn PDF document text
    • http://sexuroduveso.rf.gd/haggadah_book.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_off00014eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB3 4928 bytes
SHA-256: acca07164430cc7619d0bd1f84e3ad3fc64b182f1eeed790d7fc10992404b19a
font_01_sfnt_off00015f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8E 11916 bytes
SHA-256: 345724c7a7fb1c54c7d9b2bd9850109429830f8738214aac92d40b0026892f54

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