Malicious PDF — malware analysis report

Static analysis result for SHA-256 9596eb5da1a637b3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 21:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0acb2cdcbf9703e8162f338ffa5d22d SHA-1: ebbb5c6b7188a2eb0a29c2a721c9eb6e0c9bc09b SHA-256: 9596eb5da1a637b309e607ad51bad31aacc8646ff8ab603051318a9a8ae1d89b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external URIs strongly suggest it's used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139919307ff3---nofidagazusorome.pdf In PDF document text
    • http://saringkarnwood.com/UserFiles/file/12471645158.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/xonademabosojedana.pdfIn PDF document text
    • http://full814.com/upload/files/41685772423.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/23521125282.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/mojotadexibor.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161346eec4e177---nojakuji.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jemarosadigolelufixif.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/8624533329.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xewigo.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090909433280554.pdfIn PDF document text
    • http://coumert.com/images/file/33190117093.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/71911251052.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/vipadejaxewefimemapofe.pdfIn PDF document text
    • http://keitbg.com/images/files/mezenopezuzezamomax.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/72416924274.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/60548237001.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lalofonomip.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/62758978221.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/74289380656.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/66986788574.pdfIn PDF document text
    • http://chemicalengineers.ie/images/48485698301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=clean+files+on+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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 10280 bytes
SHA-256: 51fcf46a21621dd3355397b11534d749df8f32ba97da9f4ea425a546f6629a0b
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 17988 bytes
SHA-256: 7b847e2b1d8c8a4a6528164aa0b8c63570e09c440ed6e8d531ca677754063fe9
font_02_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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