Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5cb7dd461280be…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 14:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d587f01c8a0f34b62e4fd40c7f6cbb49 SHA-1: f8e98ebefe98573c428740976420451485bb17f2 SHA-256: cd5cb7dd461280bef15436903cac16ebcafd8946db46ada8ed95e1ec9b2c9816
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, some of which are part of a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://szkolaprzybranowo.pl/ckfinder/userfiles/files/77449449008.pdf In PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/dakifu.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/bugidobuseza.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/begejovejozopazig.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/56226293056.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/gisewefugelatizitiba.pdfIn PDF document text
    • http://imoroz.by/upload/file/jasenax.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/93263693250.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/34651322468.pdfIn PDF document text
    • http://hidropro.hu/upload/67393472063.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/buxezopak.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210903114508.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/ranofunot.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/juvobawegira.pdfIn PDF document text
    • https://iohrp.org/f_files/files/vewefoxizulupi.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/30068241921.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614181a76597a---telixi.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/torixofuverififoji.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/2380097628.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/91704342099.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/59794197035.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613592ae06f9a---80632991006.pdfIn PDF document text
    • https://kham.vn/userfiles/file/89216969725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=live+cricket+link+for+mx+playerPDF 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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 10804 bytes
SHA-256: 2ca11e273969fa9e24b0c9456075050914c808d326bae091fb1a6c17544ed1a2
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 18304 bytes
SHA-256: 5471289fa8d9bd8eca72ebe4935bd4a938303434b2cef9064ba38c776a6d56c6

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