Malicious PDF — malware analysis report

Static analysis result for SHA-256 921a85e1f99bab5c…

MALICIOUS

PDF

109.1 KB Created: 2021-05-17 13:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 636a88e029a17c295b68886e6d25a633 SHA-1: a74494765e503df5145a46456f1aa8111760c638 SHA-256: 921a85e1f99bab5cfa44790a10480d083da7c89307024907693ddf27c791f68d
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 0.9994

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://leonvi.ru/strik?utm_term=what+happened+in+the+real+story+of+peter+pan PDF link annotation
    • http://rojenugilin.22web.org/sorting_algorithms_mcq.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/international_preschool_curriculum.pdfIn PDF document text
    • http://fegebekuxew.22web.org/codecademy_javascript_cheat_sheet.pdfIn PDF document text
    • http://komamoj.22web.org/texas_form_ap-_114.pdfIn PDF document text
    • http://gonojokolekovo.22web.org/electrolysis_chemistry.pdfIn PDF document text
    • http://zobevewobuka.22web.org/mepifup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laruvowamipesus.rf.gd/lopurijeb.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_8575ae7884b14edb98eda7c9f306b54e.pdf?index=trueIn PDF document text
    • http://fadudenomo.onlinewebshop.net/biology_notes_for_class_12_chapter_wise_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2842a22-4cd2-4da1-b257-44b1360d8fb6/systems_engineering_process_description.pdfIn PDF document text
    • http://gegawuwiru.epizy.com/arista_sfp_10g_sr_datasheet.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_b148b4e61f144c929d9f5183e5d7d68f.pdf?index=trueIn PDF document text
    • http://bazejufojowopor.epizy.com/apple_replace_iphone_5_battery.pdfIn PDF document text
    • http://votitagupen.epizy.com/computations_and_algebraic_relationships_8th_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ddcb91-9a18-451d-b1e4-7e78f308dfd2/kobalt_11-gallon_portable_electric_vertical_air_compressor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac11f80-0640-41a9-a8e4-a91bb74963f0/zafajukusoxidexinobizoj.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_f01346b409d4456badefe1352f343483.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_3a83b3a5444b4e2d9272befb0041d0af.pdf?index=trueIn PDF document text
    • http://maladovefo.rf.gd/joana_s_alliance_leveling_guide.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/dastak_career_coaching_notes.pdfIn PDF document text
    • http://mibofive.epizy.com/rinata.pdfIn PDF document text
    • http://zerisonapuki.rf.gd/37393318543.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_0bcc5668f7c24ad3a8f940c6f3d003c5.pdf?index=trueIn 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_off00016bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF9 5244 bytes
SHA-256: c3e7ac8029be925b129ad2237133cbda9070b76a4a70f275e8809b170ded0951
font_01_sfnt_off00017ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DDB 13032 bytes
SHA-256: 55a7fb58f7e7b294beb6249113dd9ea5a2c8fdcf2b0e75050db7cacab394a0d6