Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8abf78b0d8e2f3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 18:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2c64b16934a9644007fe293a542a957 SHA-1: 2a8cf8bffef921eb2f4d1884c2160d5a16767c66 SHA-256: dc8abf78b0d8e2f314ea2229e7abe7b93a18232f9bad7d9e89e8b6c1de23226f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, while the numerous external links suggest a phishing or content-farming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161362fd0d81d7---disetop.pdf In PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/roruvewalirobapususe.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/josafagipipewore.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/vulurala.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/mifejizotaragirabadimoguk.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/xezarekuf.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/59132423498.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/3388144300.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/82246602550.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/20628527682.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/salujutudajek.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/60497729207.pdfIn PDF document text
    • http://kmsenior.org/file/files/66005692161.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/32418564006.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/26605185988.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85264755483.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cd51725c778c6313e4c35b3d06c87a19/39213388689.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/zegaw.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/72089850237.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/foloxowakejotupojuse.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/88577024803.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/fimejusuduwi.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/suxapavigarevomavej.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilenigufiluduburugoluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+rom+gba+iphonePDF 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_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 10620 bytes
SHA-256: 389e8112c183eec37768111d372610bd3eeca46fbf3f09f8f3bd87d9e27ad638
font_01_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 17916 bytes
SHA-256: 8b3a33f05f7947946f6b59fde9d99e93fa5751f45842ced3ea7e09e1a8c0cea3
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1