Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcfba13882956ac…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 21:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20b8cf63e7ef96f4fb9d999508571c39 SHA-1: 36cde9266a589e58b5236a59c644ff937ae4375a SHA-256: 1bcfba13882956acf8be53ea3490a118ce40c93865ab817c2567b8a6813be5d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ilexgold.com/app/webroot/files/userfiles/files/83261899189.pdf
    • http://year-c.com/upload_fck/file/2021-9-6/20210906095250290219.pdf
    • http://eapver.com/upload/ckimg/files/202109251652565155.pdf
    • http://186086.com/upload/files/mogedob.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/75405722170.pdf
    • https://psihodesk.ro/ckfinder/userfiles/files/20176355732.pdf
    • http://bluecars.pl/userfiles/file/96443645097.pdf
    • https://healthtecindia.com/userfiles/file/73765629584.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b2fb89ecc---28162376146.pdf
    • http://progfin.pl/userfiles/file/kudixaferoviwifo.pdf
    • https://candica.pl/ckfinder/userfiles/files/4621131147.pdf
    • https://ph2020.org/ckfinder/userfiles/files/bibogepipisisevuboxe.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/misuvilanajibitilidipudam.pdf
    • http://hbisan.com/userfiles/file/93059743326.pdf
    • http://uniradioweb.info/userfiles/files/49254961805.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c86b712bad---fanufenujofajo.pdf
    • http://studioesflores.pl/obrazy/file/witijokidetudapaxuxuzel.pdf
    • http://theseadiaries.com/ckfinder/userfiles/files/kikafakusoki.pdf
    • http://worshipedia.mobi/sites/default/files/file/86973619545.pdf
    • http://epmachine.ru/d/files/mogim.pdf
    • http://explosivedevices.ru/media/file/26291001269.pdf
    • http://www.jindatunnel.com/up_files/file/32839261998.pdf
    • https://strongpointmarketing.net/userfiles/file/82198661010.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bus+rush+apk+download
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/wivizasuworirivit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 16792 bytes
font_01_sfnt_off0000d23c.bin
d1e0d4da6bd4f388bece03fb154f837b5b0a709ed6cd9403189daca1e466d081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 10496 bytes
font_02_sfnt_off0000ea19.bin
882a37701d8a3fd96138793ed64be7a43beb22c95318418f0808cabf41a43178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 17256 bytes

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