Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a0eb6c96857b86…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 08:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95441b704545ff97f5d2d89c2b849bfc SHA-1: caa9954fedd4df98fceff5089535c4f0033c578b SHA-256: 03a0eb6c96857b86fb8acee1ee80e76b33886c2b292320f707a99b724a4b85df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to redirect users. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic firing and the ClamAV detection as Pdf.Phishing.Trojan further support a phishing or malicious redirection scheme. No scripts were extracted, but the overall structure and URL distribution indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://studioriboldi.eu/userfiles/files/65531929175.pdf In PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/mudojevidabi.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/gevozodepipironomalizimaf.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/88058237841.pdfIn PDF document text
    • https://kaparatt.com/images/File/20109683692.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/sumuselajeladifuwaremo.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vitofuvaruzizak.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/tutinovegizixogu.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/88498605536.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/13366436704.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/98428234876.pdfIn PDF document text
    • http://dnepropress.net/files/file/kitinesukinojigu.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/rewaxewexotipiw.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/filozikobanejevevumibe.pdfIn PDF document text
    • http://tiquital.com/documentos/file/74919065043.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210917034359.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/rilipozabikurikin.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/81269274582.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/27427002667.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/43409530692.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wivufopogazewibidukokudex.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/zazeza.pdfIn PDF document text
    • http://climtech.com/files/files/48159266077.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/vadufisewal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=excel+file+to+pdf+converter+software+free+downloadPDF link annotation
    • 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_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 17580 bytes
SHA-256: 2e2b2068d9ebb4f3c8ae5a1d1492586e132b2d975b2ebb282c151152dfdad971
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10848 bytes
SHA-256: 3c1a891828cdfe6ca234d3398ae86daeea5c2ee0a4d94ad1e48bdacb5c0c50a5
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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