Malicious PDF — malware analysis report

Static analysis result for SHA-256 490129ed0524597e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 19:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e246b0a39985b71c102a48249859ae26 SHA-1: 1f23b1d501ff12558eb8773f3211596bf6db24c5 SHA-256: 490129ed0524597eb614598492cee643b7920ddf4b9dc2e3366ec8f0fa2c8f3e
214 Risk Score

Malware Insights

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

This PDF document exhibits multiple high-risk heuristics, including ML classification and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, combined with the heuristics, indicates a social engineering attack. Specifically, it impersonates a cloud document service and lures the user to install a browser extension or update, likely to facilitate further malicious activity such as credential theft or malware delivery. Embedded JavaScript streams are present, suggesting potential execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://hbaoge.com/upload/files/zusesofezapaposipi.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343dae21655---37751861570.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/jonitigegizidajobuzulukuv.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/73224183191.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/33872449307.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/80258754340.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/67740387770.pdfIn PDF document text
    • http://cochemical.com/upload/files/tokejexamipopejilug.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/32f094e4f701079f4dfe8a96866cc66a/vimotirebujividawofofuso.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/fopezapanuso.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/78613772677.pdfIn PDF document text
    • https://tckontrola.hr/files/91964915227.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/sinegifukavawatiginijiwuf.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/82680386204.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/tiputakezeze.pdfIn PDF document text
    • http://huntland.hu/upload/file/famez.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/49226623292.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/liweduxani.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/nipifebubaferusu.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/foguruvaguxux.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/92099222175.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/54402178773.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/jamajawilafek.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/jefoxosumevonid.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pupibinipixituvov.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/48777089535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=transfer+files+from+android+to+chromebook+wirelesslyPDF 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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 17080 bytes
SHA-256: 97f11a334cfb5815711c19b6baca953a977e29432f5f79ad532dcb79edcd48f8
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 11136 bytes
SHA-256: b0d0d78a8c2fa01d715fd247f15282a3d3f0fcc5e820da3c36524b37c8c39524

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