Malicious PDF — malware analysis report

Static analysis result for SHA-256 510e99e277082e1c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-22 14:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71a7abf716fb4b31d88a519a23c78b58 SHA-1: 937f5398ad2af274b2fead6a32483fe6fcddd0b3 SHA-256: 510e99e277082e1c8b79dac81e53bba0f865946b925c8a8bba0a983135f8db4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, a common tactic in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://danfort.lv/userfiles/file/62425992439.pdf In PDF document text
    • https://drjou-vc.com/upload/files/7465015693.pdfIn PDF document text
    • http://reichspfarrer.sk/file/lediva.pdfIn PDF document text
    • http://fabtur.ru/upload/files/mubuxis.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/48883848486.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b669121a825895f003ae33df3713f9c4/66229474544.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/49883904097.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6139c651d3d61.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisewixomixer.pdfIn PDF document text
    • http://muszempilla.com/files/file/2264745129.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/tiwarapenemakibipulomo.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-22/20210922144512817774.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/sofufo.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210919071048_r4jwwx.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/18603935563.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139d603dc06b---ribuga.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/kenigosubarifaxo.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613147d01f44b.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/fudojodo.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/tapisopaju.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/lekoviwokigazusuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=instax+app+for+androidPDF 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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 16272 bytes
SHA-256: 5ba324f924c6cac567841492041b4d55ce81ff2918714febeab70f3f06c9ae2d
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 10368 bytes
SHA-256: ecebb0e6db6309229570b428b787225418f984f75b67ba582d4673be229b6d1b

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