Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d4591f5f7470cf…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 18:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64c4590ce73a1efd684fb115a3e24687 SHA-1: c8b2760d30904271a55cc5c6c0d762566d721329 SHA-256: e8d4591f5f7470cfb50626ff65d5ca75b8e6d0e1c86187c6a0308bae0256b6fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also features a large number of external links, many pointing to unique PDF files on different domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The presence of embedded JavaScript and numerous external links indicates a likely attempt to lure the user into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--72c7caerxx0d3a9eve.com/UserFiles/File/dabefimowosijovife.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862721db09---sutufidikonumajelepiwopib.pdf
    • http://riccaassociati.eu/userfiles/files/nukafotifugozu.pdf
    • https://vinamex.info/uploads/news_file/ligiritavixaxasaruwo.pdf
    • http://tuclubcr.com/campannas/file/2903474557.pdf
    • https://leifs-auto.dk/images/file/63419871666.pdf
    • http://abdon.madteam.net/ckfinder/userfiles/files/59876554633.pdf
    • http://gdlianyu.com/uploadfiles/file/vogizulegalosuvuta.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/kopede.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/40639945471.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613179f3ead22---vuwibokikonamasip.pdf
    • http://neza.cz/UserFiles/File/28568060258.pdf
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/jitifafojutivojulo.pdf
    • http://wakesup.org/userfiles/file/zanuwuzovekel.pdf
    • https://ost-fogging.com/upload/files/tutas.pdf
    • https://ngusacdon.com/upload/files/gifovotofo.pdf
    • http://drivescuolaguida.it/userfiles/files/sufejovolonabiloba.pdf
    • http://haiannweb.com/uploads/files/xikemelotisotej.pdf
    • https://planningpvedh.nl/ckfinder/userfiles/files/88757292295.pdf
    • http://ajk-opakowania.eu/upload/fck/file/nuwuwelafegedepejakerera.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/30840583808.pdf
    • https://etcbt.com/userfiles/file/menawaribozopigivupewokom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=shqip+iptv+apk
    • 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_off0000b8a9.bin
da1b252f9ae818fdd7d847e67b57992494686ca431c301647209b536f3ef5e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A9 10056 bytes
font_01_sfnt_off0000cf3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 16792 bytes
font_02_sfnt_off0000e74e.bin
10b74392d400f3e2b0bddc835ecc582c8994fc484e1b862a2981a8ad5b83ef35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 16828 bytes

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