Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd805afc86deaad…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 11:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c20d09bc6fe7c9f86282b9a68dcbcd57 SHA-1: ab27df7cdce2637287203ff55f8e63304498fb46 SHA-256: 5cd805afc86deaadb42db256d6b0060f91b66f2fd7fb0baf9363e71e7cf13359
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple distinct hosts for links, suggesting an attempt to obscure the true malicious intent or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://tauthuy.vn/upload/files/15586799141.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613558981561a---97550922426.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/zipelujatetajojugepebas.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/51675931488.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/lebakufup.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/miwituxu.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/tufosapuxusorinavuritoduw.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/vanowilomilopodozolo.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/juvalevuk.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/64842886472.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/wepoda.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/sevobivefuligub.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/40192779274.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109010629593618.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/25352238183.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/giromobe.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bitovedal.pdfIn PDF document text
    • https://lecachet.fr/docs/files/xubekitizofamexofi.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/27702122821.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/tibudipujutivimokux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kingroot+mod+apkPDF 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_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 18568 bytes
SHA-256: 491abab676a02b951f25cd0f89ad5d3209eef4d297dcb5aaea584c2170de9037
font_02_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 10472 bytes
SHA-256: 88800dfe8d939e9fb71e86f1b545cbf79ecbf1117505933f39aaa0837185f651

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