Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2891051ebbfb6e5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce58ce413e4b604a1b2b654f2f19a5fe SHA-1: fe57b1abe076cade1b05265763491246a1236bb3 SHA-256: c2891051ebbfb6e5ad58bca7b1c4c4e7a1df6e73d08536a832e9e868eda0dc56
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ig-einheitsloks.de/medien/file/pewegoruzedekawo.pdf In PDF document text
    • https://asiapharma.la/files/files/rigezoxorawukemeguzinol.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jopaniwatafidap.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/i88m3s9duripe2351m66ghphjk/sujipazenifilejiziketuwox.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/murarunawokiwu.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/82784928637.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/65710842194.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zuloju.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/55734484313.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29347247317.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/bidotolotafinitufojadubu.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/96770037582.pdfIn PDF document text
    • https://superpart.com/files/jupaxamo.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/60589957187.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210902163054888555.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1qvtcgd3cppj3gg0pgq9g0cc4/petalufuzaredidas.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/10329111352.pdfIn PDF document text
    • http://apart1day.ru/file/76955596854.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/kasenezunu.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/54723114391.pdfIn PDF document text
    • http://chromavials.com/d/files/tatovis.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bubajeki.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/30386247844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=face+changer+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_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 18688 bytes
SHA-256: 667385f6662a370c38e3369812de9800e810cecdf260fa02bbb2fde57e812a60
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10200 bytes
SHA-256: 8f1916558c39bb17a03482bc769f123363252f6fa60832fe688951d108e6303e
font_02_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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