Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8803182c2e8c0c7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 03:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 596450a6174d287df5377c9a5b5fed6a SHA-1: d665dea573baf36e99ca8583e838511a00f6fe39 SHA-256: e8803182c2e8c0c7569068c55105f11526949c3a842530c5ec742da77fd1310e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts further support this. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dent-pro.cz/pic/file/modokapuzekaxurokagu.pdf In PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/75316252179.pdfIn PDF document text
    • https://arendic.cl/files/jarol.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142c87662c---nejufanu.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/kilifadariral.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/54605071894.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/kemujajetemo.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/66070223672.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/71452834545.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902060627.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/28952839091.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/57254158020.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210920_021937.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/72216311923.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/gokoviwijesotopej.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vutunemafujasib.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/11001173532.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/24523085883.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fotizewanubapubebosise.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/68jp8te6klhnjlo76ll17df6uu/waxesewitukevojef.pdfIn PDF document text
    • http://raczcsalad.hu/files/mubaje.pdfIn PDF document text
    • http://le383.com/uploads/files/18049060638.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/20316696855.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/pamutotuzat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cool+math+games+moto+winterPDF 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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 10672 bytes
SHA-256: 195075e748f45d5e444af6d5f5b3245648cddc7cff3b282fc94f26df54247caf
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16872 bytes
SHA-256: ed6e8339fc9fa05863f53e8e76579767b153c21fce0bb277019227d131a47687

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