Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bea03ffa96c76f2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 07:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab0bce5736488689242a97fb0581ce1c SHA-1: 255ebab810053c8c070ea5ae53645cb75c2c0b2c SHA-256: 4bea03ffa96c76f270c64b464ab0c5a51578be1228914275163a2a6cf419cba9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through numerous links on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.vita-organic.eu/admin/ckfinder/userfiles/files/13524533604.pdf In PDF document text
    • http://lightofislamonair.org/uploads/files/7786763887.pdfIn PDF document text
    • http://elskenecologie.nl/files/39437498167.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/7522998273.pdfIn PDF document text
    • http://z500.si/files/49578631495.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/tolevejoseworijevumura.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906140235.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163098982691.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/82661744344.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426f8b2af37---keduligedizixodagubaxel.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/83841474956.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/97976468217.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/50573186176.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vutitef.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/15616877673.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161367159815cc---bajujizo.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/90648091014.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/veretomisareletadato.pdfIn PDF document text
    • http://eksternest.be/images/file/42529165851.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/91530736679.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/14731447835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=king+of+fighters+98+apk+obbPDF 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_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 11188 bytes
SHA-256: c7fdf9b2a56d760497a0913711604aa78b8b879223b4a5f8ebd7a4508109d534
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 17500 bytes
SHA-256: 2bd0d445af5c07d95b64d3b83f6cf57540dc9e4009f4942190dda83601196388
font_02_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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