Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85a37d4d0a5468c…

MALICIOUS

PDF

67.7 KB Created: 2021-09-21 04:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ef4e29c122aa1163380aa131f71cce4 SHA-1: d22b54405d47a8dfb11c1c7c57e67c1ff51ad4fb SHA-256: b85a37d4d0a5468c627ebfa27a170cd434e5b2511f84008058df79e874cdf729
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are structured as download lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=pokemon+let%27s+go+apk+android
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tidovokerevi.pdf
    • http://etcpremium.com/userfiles/files/78416110292.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/35305920014.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/7062346931.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/sugezuluberuvadof.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tagez.pdf
    • http://kompassztuki.pl/Image/files/8283375689.pdf
    • http://perfect-gallery.com/userfiles/file/72990418667.pdf
    • http://gleb777.com/fck_upload/file/lijukigiluwemasozeref.pdf
    • http://kisito.com/userfiles/file/naluxepepusexawemesasana.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/pusezefowopixibemata.pdf
    • http://portalcom-b2b.es/img/user//file/_0958086001631172757.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vimojumuvapipogikipukit.pdf
    • https://basisnomor.com/contents/files/467282030.pdf
    • https://gabconstruction.com/ckfinder/userfiles/files/85323014127.pdf
    • https://beamstraffic.com/amb/userfiles/file/44664638571.pdf
    • http://investgeorgia.ge/userfiles/file/59525232858.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_off0000a8c4.bin
63502956de5c7d59ef6993aada0f6cf264dfcedbcd2b2dadcb3c952030d0887f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C4 15636 bytes
font_01_sfnt_off0000d08f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 16792 bytes
font_02_sfnt_off0000e8a6.bin
d8ed61c7e9a2c4daed0cf0d985bfd9d823bbe0254e84a1f7bd53ab5a6bb2207f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 10864 bytes

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