Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df4e0644d77f35…

MALICIOUS

PDF

79.6 KB Created: 2021-05-11 14:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6bcdd538151cca3a404021517f37358 SHA-1: 187827cf0f8fcfd9021d7f72b88e928ff788dd57 SHA-256: a4df4e0644d77f35c1a86267267a6d8828bd417b39341405dbd4d89c2926ff7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://vilenefex.ru/strik?utm_term=mitosis+root+word+definition PDF link annotation
    • http://sijemogezabusa.sportsontheweb.net/character_development_in_film.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/jejhcge/fca_client_reporting_requirements.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/the_education_of_little_tree_summary_chapter_1.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/ct_file_foxit_reader.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/mizuburonetixegowubimid.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/qOBUhdo/donurogujetevuk.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/32932923820.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/gisukeji.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/gMHQZhg/solucionario_castellan_2_edicion.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/iSifcib/86634547483.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/conduction_heat_transfer_arpaci_solution_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gawutapiji.rf.gd/french_alphabet_in_english.pdfIn PDF document text
    • http://fokogemuzaraw.epizy.com/leaflet_bahaya_rokok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad6936c-ee29-4d3d-b293-a62f5f0abba3/numowuxexuremo.pdfIn PDF document text
    • http://fumonabuda.rf.gd/automatic_door_opening_and_closing_system_project.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/how_to_tie_a_toga_with_a_sheet_female.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e41445-4c8c-4d12-8be8-0319c92ad544/what_is_kerrs_model_of_curriculum_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5038f4d-6e5f-418a-b730-6c4d2d63f389/what_is_the_suggested_order_to_watch_marvel_movies_reddit.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/78072055221.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/wadabubulubejowirami.pdfIn PDF document text
    • http://sugizujesel.epizy.com/assay_of_benzoic_acid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57965c31-c3c0-47d2-8269-ad765bed556c/what_exercises_can_i_do_with_resistance_tubes.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/pediatric_advanced_life_support_study_guide.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 4756 bytes
SHA-256: 851f9f06c4e16dddc11bb130cb7938b7e0cadb51bcbf11468b861018a35503e7
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 13052 bytes
SHA-256: a8ae49d3aafcbc2951d23117529ab3749142e5a9642766ce30f72d0d9c5a4964

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