Malicious PDF — malware analysis report

Static analysis result for SHA-256 42182334cc9c995d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 01:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6693bad857dd7ace229038df8f7a0ecf SHA-1: 32a1cc047232a57c1b95c5d9a5febfbe9b43b8b4 SHA-256: 42182334cc9c995da776a7068c727a2be96112f1c1dbdc185e449aeafe8ff8a4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were extracted, the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2404bd64---38445821798.pdf In PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/83935159288.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/lofonodasitebuj.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/wufojufaxutefagage.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/86421411959.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613289152189e---77599217365.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/85659294392.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/34248a150c6f0ac26abbd90cbef59da0/40128479052.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/visupazewerobesaku.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/98198521592.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/6165356759.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/mesupakegubevefigut.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/zirarubuzedamupibibiti.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/kudajudejegodivolizuxid.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/sexugotefu.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/99046097692.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/76492557292.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/79986596099.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/60577666346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=calauan+laguna+zip+codePDF 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 17728 bytes
SHA-256: 2750547e8d53e93c09dd1f43125ef34dc770db55bc09a098ac3b73a462c88839
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 10512 bytes
SHA-256: 6defbf6d990e55263015ea0260e1c776ea44117a54d60f1eb96c99dea9b8c8fd

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