Malicious PDF — malware analysis report

Static analysis result for SHA-256 4093e238f721a9df…

MALICIOUS

PDF

90.2 KB Created: 2021-09-23 09:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8da9b4a71c787a0d27b636851f8a332e SHA-1: cf467d196be4c067a5e4aae313277d488bc6a910 SHA-256: 4093e238f721a9dfdd7ea81380d9033e42f196fc3e75769f6901c9b93595bb2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://synerhu.ru/uplcv?utm_term=o+holy+night+duet+sheet+music+pdf PDF link annotation
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/84603383612.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/puzifepeto.pdfIn PDF document text
    • http://salkim.com/userfiles/file/14577605942.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kizapevi.pdfIn PDF document text
    • http://bscartridge.com/pic/88737736201.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/16104881610.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6r7g0mli8oj0u4hv4geboti7q6/jimofiwuxukar.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/88650222044.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/nemuwizolizubawanoloxo.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/vogisin.pdfIn PDF document text
    • http://byecook.com/ckupload/files/33363085222.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/14808424708.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5e08844c---tewigigako.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/nevinek.pdfIn PDF document text
    • http://coolscape.info/images/files/nadadumiwidupuvukuvunoni.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/96276243513.pdfIn PDF document text
    • https://securitydm.net/slicice/file/xunirusimojodax.pdfIn PDF document text
    • http://erdbau-rauch.at/mitiwubemeneregozelovixu.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/dinetatixijotop.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/76685730660.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/masuburi.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/59739417229.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdfIn PDF document text
    • 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_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 18744 bytes
SHA-256: 3b69d8225b31a4914aba48a3d64e90e6c1e9ee4585d1a730ec5bd693def40166
font_02_sfnt_off00014196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14196 11044 bytes
SHA-256: 3b91a9d547d8b354c2832562f6ba7b008c47bbf1a2315dc787139ecf0cce60a1

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