Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdda08c2c57e38dc…

MALICIOUS

PDF

79.6 KB Created: 2021-02-20 00:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d46aa0c657ff4d5625c994b204bfbd14 SHA-1: 138b39eac7834cbb81ff72b420c87ce57cb9fbc7 SHA-256: cdda08c2c57e38dca6825a75a2d58fec8390cace9c639f369f9bf3d71fa41d33
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://druttle.ru/wix?keyword=aves+de+presa+pelicula+completa+en+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/zazifutunoj/jjdifja/lakitubivu.pdfIn PDF document text
    • http://wumofuzusagumo.22web.org/new_writing_task_2_2019_with_answers.pdfIn PDF document text
    • http://converstarget.ru/how_to_create_a_timesheet_for_workhs2c3.pdfIn PDF document text
    • https://mijeridofuba.weebly.com/uploads/1/3/4/6/134677835/vigozozimajebigexer.pdfIn PDF document text
    • http://krokoboko3.xyz/lofili468vl.pdfIn PDF document text
    • http://lighterusb24.site/coca_cola_annual_report_20149legw.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/ipEIbgi/border_patrol_agent_application.pdfIn PDF document text
    • http://pasasem.iblogger.org/kedoxamozatetag.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/23014705902171k5.pdfIn PDF document text
    • http://top-odejda.com/snap_on_scanner_solus_edge_reviewsir2u1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_6030389bddd5e.pdfIn PDF document text
    • http://dalkomis.website/tazaxowoko84i7l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_601559f26d0da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanukewefigani.rf.gd/kujemejakojemigisebozude.pdfIn PDF document text
    • http://dozafuzap.epizy.com/jokaxidiwomabo.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 5480 bytes
SHA-256: 9a89ca9616e07045412f69137bbe22d7f19b4693a436d725bd4db0d3f0dbf57f
font_01_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 3884 bytes
SHA-256: d0e224480f7a685d06404407bd6881b16b18c2a854388d517aa3ccc4557d92ab
font_02_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 11860 bytes
SHA-256: 04d60d103e8541afea27a43ad65c7be2cd7e446025e9c7fcc8bcf2eaf3fc9814
font_03_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16516 bytes
SHA-256: 10bbc112229225df402a7e229ef91849486990fee013407f915ed4790247ed5d

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