Malicious PDF — malware analysis report

Static analysis result for SHA-256 b747f2084f336408…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 20:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfc3e4f502dfeb711da45f9f9721586c SHA-1: 19eca164ead335b0b9121054e82a6c7d4e547fd9 SHA-256: b747f2084f336408e42536872894a3af5d2bcdc15d105f1e59cf0070e07a25d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many on disposable domains, suggests a link farm or phishing lure, likely aiming to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sakaryakasaplarodasi.org/userfiles/file/7739459770.pdf In PDF document text
    • http://csc0731.com/userfiles/file/20210903075309_7ldl3h.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/59415826672.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/91710439585.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/78872720267.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/zapozufogilutitebabiva.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/9757947356.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/bigesizusexaj.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kosezikopagizanovobomugup.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/jixizudov.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jiriv.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/pejasalozowapejumuwogese.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/83713395901.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lefiwolinuvi.pdfIn PDF document text
    • https://funke.be/data/file/boxojenu.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/93054579314.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/97962108671.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/dekusapavevazexisirug.pdfIn PDF document text
    • http://eko-uklid.com/files/file/zujusume.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/50452626378.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/91014479816.pdfIn PDF document text
    • https://lecachet.fr/docs/files/99513793722.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161348e95b16f2---mowuxutulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=global+warming+of+1.5+c+full+report+pdfPDF 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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 11412 bytes
SHA-256: 14c0d7baccccf7dbe07d99569cb2992279accbdaa791810c5747168dc36d589e
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 17636 bytes
SHA-256: 96199d5bb50e021a225c53340bf3ca7c04d7bcf2082fa09aa734a75242afe777

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