Malicious PDF — malware analysis report

Static analysis result for SHA-256 5731be8ac8c2b5fa…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 00:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6804134e6830c9ece7ae2314dff7bf2 SHA-1: a70fefe9a33e8dc81a1ef8ab2dddb023819aed9b SHA-256: 5731be8ac8c2b5fab04a56f619d31dd06a9ea02207655df7155a291c9ae592d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://toyteepee.com/uploadfiles/file/210924191611964267jtzzze.pdf
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/venuziba.pdf
    • http://associazionemillesogni.it/userfiles/files/13850725010.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/sowul.pdf
    • http://hyundaidongdo3s.com/images/files/67429541445.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/foredo.pdf
    • http://kidsjeodo.com/images/files/7316289022.pdf
    • http://shinies.ru/img/lib/file/34286037311.pdf
    • http://www.lircai.com/web/inline/file/59230304116.pdf
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/30857508245.pdf
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/xexoxesegamawonadol.pdf
    • https://warungmimpishio.com/contents/files/13825889801.pdf
    • http://theexplorerthai.com/userfiles/files/50245926181.pdf
    • http://geologocarmignani.com/userfiles/files/60554879217.pdf
    • http://com123.vn/uploads/file/24014848633.pdf
    • http://fpole.ru/sadm_files/16005892238.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b51de1f97---22641438735.pdf
    • http://masonhn.com/d/files/jetowuxonebonusumo.pdf
    • http://fittbikese.hu/files/file/40673401623.pdf
    • http://parcroyale.hk/userfiles/33058750238.pdf
    • https://simpangkanan.com/contents/files/10042492977.pdf
    • https://didacostruzioni.it/userfiles/file/32677272718.pdf
    • http://ngnjl.com/userfiles/files/gekilofuvolidaxejububi.pdf
    • http://theseadiaries.com/ckfinder/userfiles/files/84766801128.pdf
    • https://dunaweb.co/bg_image/files/xigol.pdf
    • http://finpacecuador.com/userfiles/file/68307349115.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=inazuma+eleven+go+strikers+2013+download+free+android
    • 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_off0000b171.bin
2c6cc272a3707dc6ce3d84470e0d78bf19f6f27863b0b2b484225d6a43e07c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 17028 bytes
font_01_sfnt_off0000ddb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 16792 bytes
font_02_sfnt_off0000f5d0.bin
50d898030c6c7345200914a4ec602cb12725294b0594607d7976aa6b104ec425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 11516 bytes

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