Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef41d5f75767e17b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 10:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f6d3a608e29bc7c4d64f7e6cf0ef3df SHA-1: f6262d6d1e580a6cce991f6f4885b8c66cbb58d0 SHA-256: ef41d5f75767e17bb63c69d40498b5c89d70757c1b2692fe95472a5d77102d8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://burelomdo.com/ckfinder/userfiles/files/24108927239.pdf In PDF document text
    • http://ondrejkocar.cz/img/file/66775496430.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/60163875444.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/30562328942.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/dapusasete.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/posevugutiwivuzorol.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/92313680244.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210913075538.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/zozukezef.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/15883761874.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/43507556141.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/rawuvamewemosobav.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907105800_so3g67.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/69430488759.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7a2210af07368b4d35672c5f35d8db8e/gafabek.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/jokunotilusaxas.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/7294847476.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/56653486719.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/94533320819.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/metesomozivopanozolodoto.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/kirifegilixazij.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/zoguxarexino.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/1811292190.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/ritomurowokeso.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed050828b9---xavelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=when+is+season+5+my+hero+academia+coming+outPDF 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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 11112 bytes
SHA-256: f852493e5657d19739bd37797dbc23cae61b02d31c80b35084640e71fd68804a
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 20504 bytes
SHA-256: 993a9903a9ec44926c391c17858c757c67253552e53b92635767498a0bed72f3