Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac1e0ac84b0ea2d…

MALICIOUS

PDF

71.5 KB Created: 2021-01-24 00:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6f6763b25b440643baec347902afd53c SHA-1: d3d6afd9f2a200ae9717b9339a77087c144995b5 SHA-256: 4ac1e0ac84b0ea2d4fdf8e615bb40dfe4e174907be906c093f57179b0913f299
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/123?utm_term=john+deere+757+parts+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5feaec33abd93.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jjdqieL/diluruxemunaturavonitit.pdfIn PDF document text
    • https://site-1168357.mozfiles.com/files/1168357/69453953522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fe5648fea3c1.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/gjcigid/17616248524.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/a4Jgcjd/aliexpress_curly_human_hair_wigs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404520/normal_5fcf418a152e8.pdfIn PDF document text
    • https://site-1177404.mozfiles.com/files/1177404/image_editor_free_windows_7.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4391047/normal_5fc902046df77.pdfIn PDF document text
    • https://static.s123-cdn-static.comIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevelel/fajitufutoraju.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/movowow.pdfIn PDF document text
    • http://zuxujofuteme.rf.gd/1882579155.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/a._m._p._m._time_worksheet.pdfIn PDF document text
    • http://wexugemo.epizy.com/isometric_neck_exercises.pdfIn PDF document text
    • http://gavuzolu.epizy.com/free_simple_cash_flow_statement_template.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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 5536 bytes
SHA-256: 495473de4654de45dcfc6b0e9290df9e5ea16598393a682f432f3a17fbcb56b3
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10892 bytes
SHA-256: ca5b892e8355aadb72b34a1284d416706455f759614ecc8a8794a2138127017f

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