Malicious PDF — malware analysis report

Static analysis result for SHA-256 5221b4e5bcf243f7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 01:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb230648bfa5c778498f6b2a275034e8 SHA-1: 10e6af14f3128e0a4211d1491bf1dec2e5c37192 SHA-256: 5221b4e5bcf243f77f2575bb579b686ebe035e1bf7ea4913df064b412d01a43b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and multiple external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the presence of numerous links to potentially disposable domains suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://crewmak.ru/uplcv?utm_term=card+wars+download+ios PDF link annotation
    • http://saiprogetti.net/userfiles/files/dawepanida.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/liderise.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/towabanajijuzelejilawam.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/pufinunakotuwedanabu.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kojetiresusidip.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/34883138553.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e60c67bc68---semafulizazateluxofovawen.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/gekidajexiv.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/vipexumimupinazekarobalo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/61779646600.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/92510446835.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/15376411224.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/nobojuvatabojowuve.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/dipegut.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/99201282052.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/puxiju.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lodurofojoberetezakubibin.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/38117144718.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/76760382017.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/57363972524.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/xuwejarewasodeganozule.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/56063390544.pdfIn PDF document text
    • 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_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 17984 bytes
SHA-256: b7e4b513ce0ecbda0705c11ac10febaf63d88caa748f268c571366c57eff0f35
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 10128 bytes
SHA-256: 1513b017b811e58b600c278dba0408447ead30a3ab89f534f385beff8e2151b9
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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