Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7dcfe5608d8d66…

MALICIOUS

PDF

69.1 KB Created: 2021-06-09 00:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c8be8bb8f71413b41f83871b3049bc36 SHA-1: 218a656f8d5d71b673fed8ad48c478ddb6ad43e6 SHA-256: 1a7dcfe5608d8d661000acca77618ee0266ba4c618bacdad8d9c4491545ea952
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary malicious URL identified as https://mezovuduw.ru/wb?keyword=rzr%201000%20turbo%20service%20kit. This URL, combined with the heuristic findings of a link farm on disposable hosting and a high ML classifier score, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'Rzr 1000 turbo service kit'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wb?keyword=rzr%201000%20turbo%20service%20kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426080/normal_602c9173d71a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494429/normal_5ffe91fd10add.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4372960/normal_60b387b6ad57d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_60003832ecf16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_603ad6beb2ace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_60158c4ccd26c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_60620fcc9f031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144474063/taniti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ae7d4b-1773-4eeb-b371-8f09cf42bcb5/craftsman_backpack_leaf_blower_wont_start.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/what_shotguns_can_slam_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c561b33-81a8-429e-918a-e13fd8b4efa3/how_to_reset_hitachi_ac_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ff5ec5-2517-460a-b796-283cc8d72d93/javirelenufu.pdfIn PDF document text
    • http://gebozuj.pbworks.com/f/43023340706.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144656355/julexijewizixipajadun.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144588210/how_to_work_out_thread_size_on_bolt.pdfIn PDF document text
    • http://sogotobev.pbworks.com/w/file/fetch/144899256/bubofegapaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec5dbc8-f00c-4339-9593-359b9c39d1a9/introduction_to_analysis_gaughan_5th_edition.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144667221/list_the_roles_and_responsibilities_of_a_sales_manager.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144626646/magidifekexodisakisij.pdfIn PDF document text
    • http://fuxotatizexu.pbworks.com/f/94411764800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5c4914-3c63-40dd-afb5-541f48b3d462/japadanexe.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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 5064 bytes
SHA-256: d005b347ca21b1d32961dbdb811d3fd50fe161a0d7e4a5f2123ae3514fc6a58f
font_01_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 11168 bytes
SHA-256: ac4c20d2c862413b731547769e63d9df3e2f2b039b5d89e515a203262a654b43

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