Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cd8b3caa9f2dc1…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 20:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af89c396849a04e3c8ff0032eb102b14 SHA-1: 076810e7e352f0325284170a279d32ed43c06007 SHA-256: 64cd8b3caa9f2dc1d3ceb60ff1ffb64b1ccd41106c5dfd7452a6b72aed94848b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161498dc72981c---zagemawazowexo.pdf In PDF document text
    • http://pickup-ws.com/userfiles/files/jekonarudowagi.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jeboxidufadeguvilutod.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/kifesifita.pdfIn PDF document text
    • http://bjjiffy.com/upload/51186722935.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/pemejejunutab.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/ritegiwijojujeji.pdfIn PDF document text
    • https://ancoraeducacion.com/images/76436577560.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/neveruxumupelos.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/23866411810.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/milelalatokumu.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/68465268340.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/visofaribewiniputipe.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/gegizijuriwomulenozaf.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3d03abdf0420d58d056795aeeb29a562/pasiwinazinilasufovubesu.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/mafugadununisesudimomexa.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/91479626000.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/demakakoxolekopu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/durufowamaj.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/52340607938.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/5012325378.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/guxanapagebevu.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/26017102378.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/jiriladida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=a+to+h+wordsPDF 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_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 9876 bytes
SHA-256: 351b089713314bd718187654514a41565998b9d3201abf99b982dcfad588ebd0
font_02_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 15148 bytes
SHA-256: 1d64266fea2260ef61fe5e18a52c41383c23b1676076febcbc80020c588bc239