Malicious PDF — malware analysis report

Static analysis result for SHA-256 de561a4671f09650…

MALICIOUS

PDF

79.4 KB Created: 2021-09-26 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 011165d71a6b1bfde4f61a7d287d6c7c SHA-1: 4600512e869a50579a273538ca72dc364c558bc6 SHA-256: de561a4671f09650560d0058ec767cea1f447502c8c09c0dc94ceec06debbb16
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a network of links on disposable hosting, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://lica.plovdivweek.com/js/ckfinder/userfiles/files/40454475368.pdf
    • http://esipro.be/userfiles/file/tugifusozivuresi.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1a1a55a6a---44207769211.pdf
    • http://bivalyracing.hu/files/file/9282538460.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5fc10a133---wovuzetakiraro.pdf
    • https://sarvodayasamaj.uk/upload/files/lawegitok.pdf
    • http://pileshoppen.dk/userfiles/file/21912294367.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/zedijiwinasi.pdf
    • http://naim.naparts.com/images/fck/file/repor.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210923_666ABEE82713D89A.pdf
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79691169011.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/togegepivobutuvokilop.pdf
    • http://tmtechvn.com/webroot/img/files/welazijaxakakolekujid.pdf
    • https://073741256.com/uploads/files/202109022315426994.pdf
    • https://magnanerie-cazilhac.com/userfiles/file/80476238172.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/41273462160.pdf
    • https://zenit-npk.ru/files/file/zakobosulinosunifovi.pdf
    • http://jpind.pl/userfiles/file/monow.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/wabukupalidozoditugixem.pdf
    • http://levotst.com/uploads/files/fenobarujuxer.pdf
    • https://nusantarabet4d2.com/contents/files/69963073982.pdf
    • http://bestbelly.org/content/files/files/zemuf.pdf
    • https://035620126.tw/upload/greenkitchen/files/47463604268.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+versi+pocket+edition
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b525.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 16792 bytes
font_01_sfnt_off0000cd36.bin
800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 16188 bytes
font_02_sfnt_off0000e2e8.bin
5cb8870834fbc87f3cb6cc1f2dabbb6717e92916042cb53c71cec3b1d133558e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 20064 bytes
font_03_sfnt_off0001169e.bin
a6a1e74835c875ae1c3547aa61b16feacb13c6e42416292ffa9bf600ace7e2f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 10716 bytes

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