Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c403c33a092772…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 08:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 971d9392a629e856e18c54e16d879f0e SHA-1: bf3b62b56a191b8410a9cc152158707cbcc0b21e SHA-256: 33c403c33a092772ae71270d0f9e1f2c7c4a475ff8cde448d87e3f128f352c0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are structured as link farms. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the ML_NYX_PDF_MALICIOUS classification strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=android+mobile+racing+game+download
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613302726ed01---xakusawezamakuluxisepit.pdf
    • http://kleinschaden-expert.de/userfiles/file/xigijegolaxitateguv.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/46245400017.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/197774094.pdf
    • http://www.workbythai.com/admin/assets/images/xexililavufopinatunopevi.pdf
    • http://snabsz.ru/ckfinder/userfiles/files/19701055531.pdf
    • https://leganordavigliana.it/uploads/file/mamizezefaf.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/47339490076.pdf
    • http://brlairport.com/images/file/laborujudebibeporidasuko.pdf
    • https://aedwea.com/upload/foto/45715197953.pdf
    • https://southafricapools.com/contents/files/wunebadiletaxitosogix.pdf
    • http://mobilenmr.com/files/files/nitejixegabozubosiruxi.pdf
    • https://suacuasathcm.com/uploads/files/73348630688.pdf
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/pulamiwidolerufikamos.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210929/file/16328722089679.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a46174e197---favudenolulupokenuk.pdf
    • http://ztkammer.at/uploads/file/pulidodav.pdf
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/pegejijobizezof.pdf
    • http://trungnguyenjsc.vn/uploads/image/files/wepuwodiluxabit.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/75298903807.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/musaxesovodavizo.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1632398372.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xuwozupudasosemixofuv.pdf
    • http://zjqzzx.com/uploadfile/file/2021092708090073499.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66384325366.pdf
    • http://sayarbobinaj.com/file/dazamelum.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_off0000b2bb.bin
2c50e6e6180e619c5b0fb9d5292fd7dc36d385da90af354b1fb19e57422768fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 14568 bytes
font_01_sfnt_off0000d703.bin
fbeebb847a87a73dab796f8fa875c344379b81aefcb1214a52668f4d9ad9332f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 10656 bytes
font_02_sfnt_off0000ef32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 16792 bytes

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