Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d8aedaf33b2dd6…

MALICIOUS

PDF

83.2 KB Created: 2021-10-07 16:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4634a80934fb93c86b5138dbfdc7a0a0 SHA-1: 3fd80d35eadda9b15207e8a4cd2cc6ec262ff91f SHA-256: 02d8aedaf33b2dd6d545381bbd6f2293043fb09f70c534822b2aef92f46f89f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=bible+verses+about+longsuffering PDF link annotation
    • http://originalcheck.it/public/img_admin/file///sikotowuzawujulupitu.pdfIn PDF document text
    • http://surausa.com/uploads/files/tujegamilowob.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/bumejazuzedene.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/kisezexeberowisukew.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908140716.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/lovulobevurefodezokit.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/57831723506.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/komorax.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021100604112273499.pdfIn PDF document text
    • http://pk.mo/userfiles/file/51950417391.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/vasarijitid.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/towera.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157205c28785---85662310584.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/84004568695.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/66745673476.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/75287711826.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/49319543765.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/wujexumugosobapese.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/rofanosog.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/18722861842.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/raxisegikobefazitezoto.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/xakoku.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1g34m8u8j45b9u028prcdj5sf6/diboxarilezowakagoma.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/12856931420.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/88022854772.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://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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 10748 bytes
SHA-256: 7e71585ac21379fde2e6f0a9c921a3b937df708ea8c78b83bc5dcadee51f8c1c
font_01_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 18884 bytes
SHA-256: 43656a8b2f4ea06b13c0be492e42971a769b35a8b7f6c011858e003c2d9e00b5
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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