Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba9163c07aa1f80…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 03:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4fd6fa76438843cbac6b76a43ab5f0f2 SHA-1: 78894ed2ae543da1e73c156f1801ea386940a6be SHA-256: 6ba9163c07aa1f804c2986c564ec60ff6dcadd4616f42fa065c10c882c4d4649
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it employs a social engineering lure to trick users into installing a browser extension or plugin, a common method for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sklep-pinokio.pl/web/uploads/files/dogazalezesifo.pdf In PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/99987433930.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/zosetuvivejodalomuzilixo.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/tupowowajagumilefeji.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/67545513054.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/51519952968.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/17329496408.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/jelewe.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/zepuvu.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210904021336.pdfIn PDF document text
    • http://lex.tj/img/file/dikujuj.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391dcf50f70---pixeperewigolabowuxub.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/30575810137.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/potavumugudu.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/fexaba.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/35699548723.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/sezikelaka.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/gujalurijasoretu.pdfIn PDF document text
    • http://www.centralperdana.com/file/88581692159.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/kinaletolukilopiluzom.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210905185454.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wopevogojenagegofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=convert+mov+to+mp3+freePDF 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_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 17480 bytes
SHA-256: ae2c6e9edb620844b9a2b0d067624799938b1f95dac1bc0ad3d57b7e7feedb5a
font_02_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 10320 bytes
SHA-256: 4e8e916d81720bd694b2676ad63ad2969fe9234ef0cca103de50d555b8b04a19