Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b68b58dc37e3f3…

MALICIOUS

PDF

77.5 KB Created: 2021-02-17 15:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8510c853c01638553d67f28c56fd19e0 SHA-1: 71e2b10f8b822943ceb7d7d63c0e5f2b83efb155 SHA-256: d0b68b58dc37e3f3522a3fd699c24e0a226eda3c1c98861eb8c4df613ab3a74c
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a likely phishing or malware distribution attempt. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=cub+cadet+lt1045+starter+replacement PDF link annotation
    • https://cdn.sqhk.co/nivunufozub/CrX9jcD/zilitiposuboxonorikesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_602044f4c895b.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/KWjfihC/zusekamujodatotatabo.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/jqjhYGU/nidemamisake.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/ihEQ0bl/dixatolinaxev.pdfIn PDF document text
    • http://pifafuvutote.iblogger.org/debawefitinufigetizoda.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/a0ji8he/71722445196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_5fe25b3bb0b20.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/jhiamFB/skywars_roblox_script_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fcf362c8184f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mevusajilitum.rf.gd/buffer_solutions_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/10th_cbse_board_exam_2019_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/nomokotilenuboxadiserago.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/47483447650.pdfIn PDF document text
    • http://lexojowal.epizy.com/indices_worksheet_ks3_tes.pdfIn PDF document text
    • http://zowonotetejubi.rf.gd/ukulele_chords.pdfIn PDF document text
    • http://geletisabifuzo.rf.gd/e_district_csc_report_login.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 5512 bytes
SHA-256: f3d5c46d04e349bd1a5d581320841f38240faca68b7fdde6423a30fa048add86
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 10788 bytes
SHA-256: 138521ff13e00ea3687a873610ff8f056a47a00ca7e51cf05cdbc673a4283a8d
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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