Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9a919d670aa551…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 09:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1359ebee0876a337497609aa7ba8a94 SHA-1: 41d6316bae7b589e05d40a68d24026db47046374 SHA-256: ec9a919d670aa5517a6164a4f1096f0a3800b08f4aa3e84a5d26cb59175bce87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, forming a link farm. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://philabc.ru/uplcv?utm_term=james+stewart+early+transcendentals+pdf PDF link annotation
    • http://4darchitecture.org/img/all/nidibipip.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/fafovexajemaben.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/nutatabedupukobiz.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tufur.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/wugale.pdfIn PDF document text
    • http://charivne.info/images/file/beduwewenujaserawetibum.pdfIn PDF document text
    • http://zzquansu.cn/d/files/22435326684.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/juteponivozu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ledm1mh24ni5sr34b8bho8nq57/wigejo.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/27385858511.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/gutasoxupozewiradajukuji.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21091516555182792235vgx.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6ce430ce370185c9d120ba5e8bc7937/nuforixid.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wufevezasobosukumivubobu.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/32407002651.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/tixebanek.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/riratemitudikufozo.pdfIn PDF document text
    • http://atek-ent.com/upload/file/tutufused.pdfIn PDF document text
    • 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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 10760 bytes
SHA-256: abc906450b9a569e434de6756e518756748e29d7586a9d1f4da0a905fff06537
font_01_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 15684 bytes
SHA-256: 116b9a770b2ce84bba8d23ef33bed8cee8b14a636e7ba9e0919738976bd4bcbb

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