Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e575a5bed253f67…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 11:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2596cdb9fdee4d000e2b36de37aa81bf SHA-1: 8ff33d0cff36b37103756a311dfd76354bf193fd SHA-256: 8e575a5bed253f679f0bc02439c760a7093906853c48390ffe3621b4dc73e1f5
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It functions as a link farm, directing users to numerous domains, many of which appear to be disposable, with the intent of facilitating malware downloads. The presence of a 'download button' heuristic further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=temple+game+temple+run+game PDF link annotation
    • http://zhymwz.com/upfile/file/76925876348.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/54973516044.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e33eb6ef---19555281062.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613923ddb1a9d---90757819548.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/36672362654.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/9222235960.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/limofon.pdfIn PDF document text
    • http://learningkey.org/userfiles/guwafabotatuxu.pdfIn PDF document text
    • http://vswet.ru/f/8156368589.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/5559856733.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/welujuzamifebulofiwu.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/38736925445.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/47702474831.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/1098233584.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/54183216127.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/bibina.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/30482422134.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/lovam.pdfIn PDF document text
    • http://agama-rc.com/upload/files/solunedef.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/69443862300.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/xudeluwakake.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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 18356 bytes
SHA-256: 5c722c199d1033c53e3dd9174cd4ad1ab36452cb18562f223ef3d422e189b687
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 10276 bytes
SHA-256: 3e1e5e1817cc76d6d6b63ba70b4ce1ebc38b39a3b9f36b2f88425851c821ab5e