Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52be11e9ccaf84f…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 10:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 481b48f05b733ee913b147974a1ef5e9 SHA-1: a3ff3f4218f527c5bf271d6bbc135227533710d1 SHA-256: f52be11e9ccaf84f4d8836993edf61cfaec383f663f0537b5f8e8ddb756ea933
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDFs on potentially compromised or disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'Prime Video for Windows' lure in one of the URLs suggests a social engineering tactic to entice users to click the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://www.burnat-provins.ch/ck/ckfinder/userfiles/files/saxiginilabux.pdf In PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/rojoziwulikimuridotozudu.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/sewugupajo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88d00049d---79471658903.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/tegadizomivazik.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/8509761751.pdfIn PDF document text
    • http://whatdwellswithin.com/file/56783027508.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/somuginur.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/wiwubapubulojazagowig.pdfIn PDF document text
    • https://deepex.hu/hirek/files/12375551034.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/tolozuloxujolopafafu.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/50532537819.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///losuxejavazolimul.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/49724128929.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/febifodugozuf.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/getamafogovagijilino.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/84338622594.pdfIn PDF document text
    • http://partnercable.com/files/75747864910.pdfIn PDF document text
    • https://shunnasato.com/96347097875.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/95251754257.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/bamixuzuvuzo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/jutegorigijalibijugofivun.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/fosukujevamozewuzuzujuwi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614303c3d83da---ximimeleponebufuru.pdfIn PDF document text
    • http://sinoorchids.com/image/file/59402809990.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210919051142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=prime+video+for+windowsPDF 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 10364 bytes
SHA-256: 5c9b10d77e8cce5dc815f10644db17d6e115d0c426c9fa4889d50c6716690d8f
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 15488 bytes
SHA-256: 47f599b5a2a477a2e3d23c61c73c5bd958483ea7f1512a77264e6e599d24762b
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1