Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b3305add0f13b7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 11:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8757d1c9a4fea7bce8edbc56e2d87cee SHA-1: f411cf09b37390c5e0e5c7cfe94be0585139a516 SHA-256: f5b3305add0f13b70091e6355b3f8b74a25f79df06ed4a2d606b9ed9c7008e80
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document as a malicious attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://chcial.ru/uplcv?utm_term=firestick+delete+cache PDF link annotation
    • http://agataklimowska.pl/userfiles/file/85097540756.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013ee10403---44484142434.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/sakaziko.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/2504402639.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/10423313695.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/48222374360.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/82475514117.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/kolepibojetet.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb773a08b9---tovifuso.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/navubovetojiniwu.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/60645829945.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091116235280554.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/49649353502.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jiwejawunoselikikub.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/87396157686.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/pibobek.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/855390652.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/40919552071.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/zupedux.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/57964843871.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/83410544097.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/26023959047.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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 17644 bytes
SHA-256: 1ad8bbdcde44f5a01ba2e57e297b9f1667a5cd0216cb4f819e44feb3656a93ba
font_01_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 10312 bytes
SHA-256: 381f52fd85fe9adba55352dc54aeaca5a452deefc762e3b86d8be2d9045d3a7d
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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