Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e936613728ac9d…

MALICIOUS

PDF

87.7 KB Created: 2021-03-14 13:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4f2a4048a1bedd050e669e81abb71e3d SHA-1: 6bd3f73e075766463ba488fac04449971f378fe9 SHA-256: e9e936613728ac9d5b49c70eb6f8545ce13b5b61a19e51c5cdd604a4d693755d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/award?keyword=positive+and+negative+character+traits+list+pdf PDF link annotation
    • http://tricitysikhs.com/siwigvbtff.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/95jfuge/celebrated_jumping_frog_story_summary.pdfIn PDF document text
    • http://hurricane1.space/saeco_talea_giro_plus_service_manual59ipz.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/honda_hrx217_lawn_mower_service_repair_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/siwowoso/9hgAlgL/blackmail_odia_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/syQhfgg/pathogenesis_of_atherosclerosis_slideshare.pdfIn PDF document text
    • https://lejalebenepuk.weebly.com/uploads/1/3/0/7/130776022/kasumidinejodiz.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/gcjjpjb/nature_hd_wallpapers_for_mobile_1920x1080.pdfIn PDF document text
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/e2b96fce9fd0d.pdfIn PDF document text
    • http://muzoc.xyz/28175838214uhzl3.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/nu7100_vs_ru7100.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/ijjjgfB/new_slot_games_free_play.pdfIn PDF document text
    • http://yognat.space/how_to_sync_bose_remote_to_sony_tvvsu6g.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/siwuxeroluzirew-zagidafe.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/RRcFNwa/sepofefaxipabefumitosuxeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezevenakos.myartsonline.com/68185956873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297d7a62-f6c3-4346-bc46-11ae6fe60683/maluvekadabub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e28917-b229-4028-a8bf-12a793b9d9e4/elric_of_melnibone_books_for_sale.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 5476 bytes
SHA-256: e9e20eee0b1c0b5cc6d3781618aeeca5138e535a58cf03143ce1b9028dbd5f9a
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 10812 bytes
SHA-256: 56d8a7805a743cdbcf56b08321d6cd2f93eeeb76aba57090ccc57ad9ea656b71
font_02_sfnt_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 16060 bytes
SHA-256: f3b9ce5085d11cb912f5f7d08ee1bae85535b766da7550e04fe9540ed2abc315

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