Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce03ebe255f7e1ed…

MALICIOUS

PDF

83.3 KB Created: 2021-10-11 09:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0bba137ff04c9aaee509bf89c1fe9e20 SHA-1: 64abaa05c9d858f6888a5e7bb2ac4c0314a7d83f SHA-256: ce03ebe255f7e1ed22e15c40eb8be229d2d9b02f61d40481b0718febb09384b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stroykap.com/application/views/stroykap/userfiles/file/11894588924.pdf In PDF document text
    • https://alpinashop.bg/files/dipifin.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/wiluzelito.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/ninonefodabesemeterugut.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/28251695676.pdfIn PDF document text
    • http://labemweller.medianet-shop.de/userfiles/editor_files/file/gewagilup.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/95339059368.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0cff226c---44432846132.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/71238598747.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/gewinetedipinoromalanul.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010121459601.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/85744935398.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/93661781278.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/rudewaxivolupisapem.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/liwifepurexo.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/dimekunex.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/28870865654.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210928_015049.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/dujotepuvo.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/tolawodefalijowi.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/79411344285.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/86750549715.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8ebe1dbb6bc1f58f20ab3c95e1f42a1e/jegamitegoxenofavewun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=use+of+english+choose+the+correct+answerPDF 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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 20024 bytes
SHA-256: 57214e21f3f590bbfcec529356ac4151d4c9dc152ad70cd9a0cf4d4f414f7381
font_01_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10708 bytes
SHA-256: 4ef84d800c0614f781cbd87bafdd768ef2e5b76ada1b81a1cd6ce54af5a9b6a7
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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