Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c9f947fb99c089…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 15:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c4a46a743ad89e68eb45f122659f4e2 SHA-1: efc59ea0646ae118090e545cd2143f6f323a923e SHA-256: 88c9f947fb99c08975af499d5e3663086ab3b39d639c1b756a90367b44a89a9d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd21bf74a---poxaxiboxejoxi.pdf In PDF document text
    • https://dennismaloney.ca/upload/editor/file/70382215437.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wawadu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/92213017987.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/44624872678.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e57a38e0a65f3a2fc6909580be2f7a9/74876109074.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/85722729292.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/jenonupofose.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/18103372292.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/wukojipuf.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/binatojuf.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090501344973499.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/026bf8af416177629133c6f6e495de4c/gilotunonezevumazoxed.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/65323997002.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/31117605653.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/17432233829.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/bedekojawumilaf.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tinete.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/movoref.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/57149396580.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/lofebofevasijub.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/21226876878.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/7467016533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=animated+face+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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 17232 bytes
SHA-256: 176e268e80e1cc391215a308d58a5dceced4ec41e0d023e3b6864835baeae7d1
font_01_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 10548 bytes
SHA-256: c1db981ca046fb7bece4ea707202948556c9d495ad4c73b2eecb6b8d99017cf0

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