Malicious PDF — malware analysis report

Static analysis result for SHA-256 d325782edf039bc0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 11:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6433d1717da000ea837ace959890522b SHA-1: 262ca0fd5a4e5c26c7bbc0e6b98eb426b993e7a0 SHA-256: d325782edf039bc0854378a229a953fb61c1a4b55d9cd9c2776dd1595f75680b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://filtrydokoparek.pl/img/all/48365725090.pdf In PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109031525058095.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/75333753423.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/40832947521.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/xuwulutobisokukukajexoni.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/5031723135.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/52240636459.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/80443319726.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/72281040896.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/sajujuritupovupupog.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/49150737401.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pupuposavat.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/761096b2f6324f599a32de4f52c2c019/jexazu.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/19688195981.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/38828870991.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/lizidusugoweponerik.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021092009573973499.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/38533703763.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1362279181613ea126b0d32.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/62627185203.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/64434856289.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68527154285.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143333b8624d---suzif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=healing+the+shame+that+binds+you+free+pdfPDF 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_off0000b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 16420 bytes
SHA-256: b6a9617de52fde97f0941462c4a555044d888eb53c8c0c79352faac9aa0867ec
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 11288 bytes
SHA-256: 32098dbf1c775b0274c96850cd7b57bdad03f7e3d6796cde3c563982ea9ba9cc
font_02_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1