Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6db7262d307e78…

MALICIOUS

PDF

129.7 KB Created: 2021-10-14 09:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f551893be754ed9e7e6cf79df1feb87 SHA-1: 89c6e41d245505e9cfdeba93c001e52cb5db7391 SHA-256: 7c6db7262d307e781dff4a68982453b6b42a18ef5e8acc3f25ff523ef0956598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high concentration of links on distinct, potentially disposable hosts, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://classtool.info/upload/files/xinobemigovefilikajiku.pdf In PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/lidikida.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/29012366488.pdfIn PDF document text
    • https://sscs-uae.com/userfiles/files/71743800802.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202110030949099706.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/98885368944.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/daziwenatikemo.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/logedatogizisav.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d06b48ca21---porom.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/12285263739.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/revof.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/lisesipawer.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/rizomipel.pdfIn PDF document text
    • http://marymo.ru/uploads/files/sajanutalorukebovolimubi.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/96864989211.pdfIn PDF document text
    • https://kimcert.com/E/file/sevemeveroxo.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/87932698128.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/79751699354.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/75165593878.pdfIn PDF document text
    • http://afro-safari.com/upload/files/ruxotabafo.pdfIn PDF document text
    • https://etimes.mn/uploads/files/51617764283.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374eebe4035---setam.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/49662739266.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/kedakevegunagamorixigoba.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/38589123410.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/5bhJmFgkeCE/uplcv?utm_term=thick+description+toward+an+interpretive+theory+of+culture+summaryPDF 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_off000191af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C6 11304 bytes
SHA-256: c486edefebf787d4c812a0f1492f9c6cfa7d5017eda809fbab3339f0f3bc9360
font_02_sfnt_off0001c43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C43D 20200 bytes
SHA-256: b5f89c8a0b2711106c2ea7eb12c8a1d9dea9876e3e85599981857d7969299311