Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b59eb34f14296b…

MALICIOUS

PDF

68.0 KB Created: 2021-10-02 19:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d1c1c58bc7cb24083a5c5534bac857be SHA-1: 90951fb47e10ec1f0fb308082ae30dbad650d3ca SHA-256: 34b59eb34f14296b57e539c2c6360d73e1414c22232c88c10aa515b01937967b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=watering+can+drawing PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ah5kpm2r81c3ru3u44mjk5h4ni/lojagomekudob.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/29622789754.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/32672024613.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/wowoguk.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/90634349356.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kodolusu.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/vitefekotafagizigalurotex.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/tenumidizejukap.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/lekewagar.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/wekirizegafiwoj.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/11603570464.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/mudenobejutijesaxixote.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/64617670198.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/88821227363.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/lunagarobifometa.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/58276824518.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/binisezarojiz.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/35898648354.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/9336557361.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/fezuvijobojij.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/jelebamodarovosiliw.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/suxoxu.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_off0000acc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC4 15384 bytes
SHA-256: fc0f2f5931823b8bab61e97e8311d9ac8fa4309053d4692182bfa8eb6eb48cb6
font_01_sfnt_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 10288 bytes
SHA-256: a707b3c43fa2ccfb2960ebdd9773aa9f8b844079c81b4debe2cd40e38e4119f5
font_02_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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