Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac73cf996ffcbbca…

MALICIOUS

PDF

67.8 KB Created: 2021-09-29 13:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2685c128fddca2d07069397d1bf48798 SHA-1: ced6eec6ac22b9e700d3117508b8fef02d5c72f0 SHA-256: ac73cf996ffcbbca25d73857d106ed800e99adc53e2692f905a3a8e3f1520357
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=stream+john+wick+3+free PDF link annotation
    • http://chukguwang.com/files/fckeditor/file/gevigezivokuviramobesiz.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/41368123160.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/11775891375.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/zabesomolerofanogaxamikif.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/bupotokusano.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/bajuzosi.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/lasibezilu.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/62732571543.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/69237792411.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/35382376275.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/wobokefasakizukibulasuma.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/98632610443.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142775697e72---serunofewemoloripapumekux.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/88621410089.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/nojixanobonawiv.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/71132957204.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/74177052321.pdfIn PDF document text
    • http://jcpingie.be/public/files/13986398619.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/13846386321.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/sezupifuwizoziwomapusu.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mitox.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_off0000abd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 14836 bytes
SHA-256: 0542a1c168cf951339584380190c8e536dbbd1aab2ddde589d9ce100cd5dbfff
font_02_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10944 bytes
SHA-256: 22f733b6c43a3915cd4708fb5951437616f37d97ca0e93e0506388d27ae508ff

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