Malicious PDF — malware analysis report

Static analysis result for SHA-256 836c3fecde4d3d57…

MALICIOUS

PDF

80.6 KB Created: 2021-04-08 23:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f359e78faa88e42b51b69d7f545ed9ea SHA-1: e91b2030e8c8a9c89e5032afe831aaa57fc01a6c SHA-256: 836c3fecde4d3d570e928486f06448ff2345c3a3685d7596e06313d04f2932f1
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/strik?utm_term=honeywell+home+rpls740b1008+econoswitch+7-day+programmable+light+switch+timer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387430/normal_602c367ca18f2.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/gij8hcu/stilts_marco_island_menu_happy_hour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_604fe4ea9ebca.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/Xihiihc/warrior_cats_game_untold_tales_on_scratch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_60363033b1b07.pdfIn PDF document text
    • http://tuwosip.iblogger.org/simon_ielts_writing_task_2_band_9.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/2Qigwo7/formula_1_racing_teams_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_8d6b42779f2f4f1ab858e2ed89a842ea.pdf?index=trueIn PDF document text
    • http://lawedeg.rf.gd/neumonia_elsevier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa2d9c6-6783-49f1-85db-1b5845538e79/tudimim.pdfIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_3a26cf3d3dae4339bfc857c6f3c7e451.pdf?index=trueIn PDF document text
    • http://zaxalakudil.epizy.com/rojipokowevabuze.pdfIn PDF document text
    • http://katanitape.rf.gd/cyrano_de_bergerac_playhouse_theatre.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_31cbeeb37e334c4f987599568fa2702f.pdf?index=trueIn PDF document text
    • http://riluromeni.epizy.com/free_yearly_expenses_spreadsheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5d7262-5171-47dc-be91-53451fbc15b2/think_and_grow_rich_the_legacy_movie_free_download_in_hindi.pdfIn PDF document text
    • http://posojorodinu.epizy.com/equilibrio_quimico.pdfIn PDF document text
    • http://kukalofawofami.epizy.com/iphone_ios_version.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_32bc2e4f8fd44a9584f2d2f4a34fcd7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/718d587e-6bce-4d2b-9f84-5e33755de0a9/vulipuvasififowog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3cf468-fbee-489c-bba0-cd160b521aa3/honda_shadow_1100_carburetor_diaphragm.pdfIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_380de3edaef84eaf84fee3550be2e9f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b38c53a-2eae-480e-9755-85a9958ca1b5/the_game_of_life.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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 6368 bytes
SHA-256: 2f6780093a7d4e25030df2dd097473547dcb110f2fc9cb72bd239c3b535c0877
font_01_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 11256 bytes
SHA-256: e7357ac7eacd02aba12fed1525afd426026f423c8482970c866d51e0422ed94b