Malicious PDF — malware analysis report

Static analysis result for SHA-256 2815f4a9a5b37e94…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 19:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b0508f97a0d08320aad6ca28751a907 SHA-1: 7f792b9ef207644c3a9bafb499f4bf112f01ccf0 SHA-256: 2815f4a9a5b37e94a8eb069850a01ce5c3462a627fcba2871eb118d8dac34036
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://delfosventures.com/userfiles/files/53394898285.pdf In PDF document text
    • https://gujaratisamajparis.org/upload/files/65363849235.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8a393218d57f75cbd066936233f80fdb/54098063263.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/ritebozinerurutinaluvosul.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/duwiligifenazorusewa.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/vimorideserakugiko.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezimekasiwerabuge.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/vudot.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/bemaguvepajipa.pdfIn PDF document text
    • https://tepihtrava.rs/files/82656678223.pdfIn PDF document text
    • https://lazerom.pro/media/file/gulegoxuzugiju.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/vekolep.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fafizijula.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vinorebefep.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/bemivatavotorobenawemiso.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210916121947_dz6uds.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/wudovenexu.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sezusulobevuminox.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/dopupibukawof.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/ragafiwozasinukok.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/6924649645.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161351be8d8d95---38904567262.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/6486929803.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/34148321341.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/55957233375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=yu+gi+oh+stairway+to+the+destined+duel+romPDF 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_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 17872 bytes
SHA-256: 3280b17b76969c1e6a9e927b64345776c48d841b1130a6d5bedf22cdcc2824f4
font_02_sfnt_off00011a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 10976 bytes
SHA-256: d9f03361b459f24fb449f53b7736537b932a2f76da825a9465678ca80d06844b