Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e471efc50738339…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 23:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 317eee6394a813d860ac69d988934dff SHA-1: 888093a1fc283b2fc90cf2a2485e1f29cd580c24 SHA-256: 4e471efc50738339b23de701244fb5ee0f98de996c9406e0fbfecf63847c11f8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many pointing to PDF files on various domains, suggests a phishing or credential harvesting attempt, or a distribution point for further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/518fdd3ac6910a50bb3607c0f72e9cd8/38593500696.pdf In PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/wupufa.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/wedakalomo.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/24828869854.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/3215675507.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/silorefetutatipodebetup.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/bebami.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rilixusuw.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/wuvejofotekamod.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/nobidesiwepozifelexuzaxu.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/wabazaxategaxivejezanaja.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/japanub.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/94231051992.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/13596979778.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210913065031.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/zalud.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xigusikejodunulapado.pdfIn PDF document text
    • https://langumeistras.lt/i/File/jefiwu.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/dojaxoxaga.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buwopijowupevozapo.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/munibugefujixixegan.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210911_CF1B86C6440260A9.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/4784903978.pdfIn PDF document text
    • https://ubranni.com/uploader/files/tabatukopemisifewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=candy+manor+mod+apkPDF link annotation
    • 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_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 17696 bytes
SHA-256: 5f53c0b937bbafaa8705e90bc92b7ed94ffe7035802388fb9b3fd5e18f4d72f3
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 10256 bytes
SHA-256: c57a84b8a679beb7b67488f24d16a376b0fdb07732075687bba1ba94e4426707