Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e5d0f80502c633…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 16:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8a3e7026d8c1be524b659142b747c7cb SHA-1: 989c53bf5a55d489e9b14768621e8694bb2964a1 SHA-256: d3e5d0f80502c6337cfa24e95d29a3352ae3c2b8170bbe794f2feb40539d4882
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://thetestmag.com/userfiles/files/39197246921.pdf In PDF document text
    • http://miyagi.chi-kara.net/Upload/files/tujaxijidopavozozoma.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/79926656177.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/89882812510.pdfIn PDF document text
    • https://remini.hu/userfiles/file/73325726491.pdfIn PDF document text
    • http://teifsepahan.com/files/file/36447694795.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/81089055214.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/60961615266.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/wofimenuwadejekefimanoram.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/1150789539.pdfIn PDF document text
    • http://zl369.net/userfiles/file/7384027888.pdfIn PDF document text
    • http://air-con.ru/upload/files/37653407886.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e9676a7170784b1957f176fba006ed3c/bexasofakuzomi.pdfIn PDF document text
    • http://bulmarconsult.com/files/senudexiwetabedotelo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/dofode.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1115795b---saxipuvofomi.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/66909818294.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/besixezumovugenenojalepim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+last+day+on+earthPDF 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_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 10440 bytes
SHA-256: a4a8b7dea0ee54c88e233dfc262227c52dcef103e50f82945158dc7aeaf5a395
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 17056 bytes
SHA-256: fd015223f0e1a2932f640ae2daba7761d6466acd6d85b006abb65e05a04a96e9

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