Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0099e5dc38bb41d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 02:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b64aeb286d9dd341f8b6eb0244cbc41 SHA-1: 90665b3b6cdbe29848941e94da01d418e8ac88f2 SHA-256: d0099e5dc38bb41d5771cdac9f442290bcdbb807f250fd45b107ffffd7b0a968
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ms02bet.com/contents/files/31045714489.pdf In PDF document text
    • http://salt17.com/userfiles/files/77610187254.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/71368929721.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kowad.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/jibudomikowu.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/27015931833.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/63479917014.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/59956783892.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/zidobovasizulileto.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/bipowukawexezu.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/piwosuzekixizusow.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/14096250500.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/siberugogibu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/salilebujazizalojila.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/72845341331.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/69054111288.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/62492858346.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149107b5248b---42376628326.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/60031459404.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/rolefojulizepijodegebupe.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/dirabenifebemuzubux.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/78123680295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=play+store+not+connecting+to+internetPDF 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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 18404 bytes
SHA-256: 959eac489eebd0ae4346cc20495edb10a9883b30389ecbe36f4caeee94f2f741
font_01_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E16 10520 bytes
SHA-256: 5be6beaf392d479285860ece2e153726e127fcb9e24c0a523b550098e3d41fd3

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