Malicious PDF — malware analysis report

Static analysis result for SHA-256 531bdcf9b66d981b…

MALICIOUS

PDF

130.7 KB Created: 2021-03-04 02:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ca8782a5b3d917ac534adaa6f959a6ba SHA-1: 097be939c77044de5bc7f09423dd17b0ce836bf8 SHA-256: 531bdcf9b66d981b9af9c85fc90ccf6ba49463a60235a5e10d73c004efd8c109
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'rainy season of India' and mentions wkhtmltopdf, suggesting a lure to a malicious site. The presence of numerous external URIs and link farm characteristics further indicate a phishing or malware distribution attempt.

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://lozipotod.ru/award?keyword=explain+the+rainy+season+of+india PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5fee7b3a03547.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/eXAUFSg/44623284246.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/2lteEQt/motogp_racing_20.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/qjeXjjd/garden_sculpture_for_sale_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5ff884d66ca41.pdfIn PDF document text
    • https://cdn.sqhk.co/niminililez/i6p1iiE/64914265948.pdfIn PDF document text
    • https://cdn.sqhk.co/kakumipoman/hChjbah/34136324266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_5fcc8b65a54c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5fd9870478dc0.pdfIn PDF document text
    • http://vuliduku.22web.org/19459113338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikinegakotij.epizy.com/xufulafazumisalasawoso.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/vidmate_hd_er_movie.pdfIn PDF document text
    • http://texokobatogu.epizy.com/chaffoteaux_et_maury_elexia_comfort_manual.pdfIn PDF document text
    • http://melufisagaw.epizy.com/30609453780.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/risidaderefitilu.pdfIn PDF document text
    • http://nakepusejedub.epizy.com/time_attendance_sheet._xls.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_off0001c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C533 5256 bytes
SHA-256: 1cc54482c2ead8ff54730c61c3a8c74482a06a607c6edb56c3d973fabef31eca
font_01_sfnt_off0001d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D71C 11320 bytes
SHA-256: 4a9df095a9e1781986386e13cc848d5496c2bd71a677f363948302e4b8b67d20

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