Malicious PDF — malware analysis report

Static analysis result for SHA-256 2430b2ad531728a3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 13:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15a29a4df42dda921d0f2734efac8926 SHA-1: 60288ad6c27d4e5e2955045edd44c7486c307d52 SHA-256: 2430b2ad531728a33c122626f7b46807fc08fc0ef45ce3276560736d95e403f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://brenna-ski.pl/userfiles/file/75407271019.pdf In PDF document text
    • https://truongthanhco.vn/webroot/img/files/bavuvivetusitewaxisulu.pdfIn PDF document text
    • http://orderkai.com/uploads/files/rutapunumulawexol.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/jekonujafalilevarexuderox.pdfIn PDF document text
    • http://sdes.in/uploads/lutebobomovazo.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/1122013931.pdfIn PDF document text
    • https://adikmanis.com/contents/files/sebufaxupikirewekuputeze.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/76010685091.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/21069081719.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zowagakiloxirenavasub.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc2d2ea6d---zejawigubafulesuzilepikev.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/burugoxel.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/20532541887.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/91203031070.pdfIn PDF document text
    • http://tzsunup.com/upload/33276716309.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/7325462519.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/98301050993.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/xebisu.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/fekakir.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/nabowisikawiri.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/32896683605.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64652614311.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/2985366753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sultan+2016+full+movie+watch+online+freePDF 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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 11224 bytes
SHA-256: c0905bac8d0a3fc4b67ffd38e2e7ac2b4b7d4b0864159b415780bfb1736918d7
font_01_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 18568 bytes
SHA-256: f191b8b72234c5c240fbb613bc83cde7a1f4649286dfdc32de5845fb05302fb5