Malicious PDF — malware analysis report

Static analysis result for SHA-256 359c86aae94bd235…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 21:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64a824b86a4dc640a3292388d4c4e0c3 SHA-1: 9951b6d139df94c137b98185dbddd8b21cd83ee1 SHA-256: 359c86aae94bd235bd066cc1e0a848009457a8227e461b79642e9cc7cbe2728c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rosritual.su/app/webroot/js/ckfinder/userfiles/files/60798631182.pdf In PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3600221046.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bowileduzesojovirusosokax.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/69521797891.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/sifatolugugoverosotibuwe.pdfIn PDF document text
    • https://mahae.hu/files/files/48682210015.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/fetefuboneviguwe.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/14179242249.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/18713771834.pdfIn PDF document text
    • http://ave-france.com/pics/files/wunetametojawulokotalimok.pdfIn PDF document text
    • http://njxinbell.com/upload/files/pedolumam.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/51291400549.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/nofit.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/betoxupofozaviwo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/trmmtf0m7fk0nl52kon4t984j1/kijagetavilamadab.pdfIn PDF document text
    • http://chenruichem.com/upload/files/werebesupekol.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/latirebas.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/barajojojuxi.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/dosizarilukofuriw.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/momotizamotutusof.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/woxepezezeguve.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0733822b---62307856452.pdfIn PDF document text
    • http://test-immo.com/file/1860791631.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/60245247831.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/25720371044.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/7577979055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=facebook+com+log+inPDF 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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 10416 bytes
SHA-256: bcffa64a40458614374b62be95f6093b7e21d3150b4f5e156df4bb0eab6c3fd2
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 17580 bytes
SHA-256: db64059f59223662f3c20f5d8b46bcaf2cfcdf0ae6772033286f59648985fc04
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1