Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7326e23a268a18b…

MALICIOUS

PDF

72.8 KB Created: 2021-03-20 06:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fa273bae0858e665456d7934a0393457 SHA-1: e5fb21c8dccb213896306fb4e314289893bbac77 SHA-256: d7326e23a268a18b6bbd4057213c01bccd1fe0c59df0a72267f2b9c0e761a69d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. One prominent URL, https://leonvi.ru/strik?utm_term=glencoe+biology+chapter+11+study+guide+answers, is presented in a context that mimics a study guide, likely to entice users to click and potentially download further malicious content or be redirected to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=glencoe+biology+chapter+11+study+guide+answers PDF link annotation
    • https://cdn.sqhk.co/fusexabuvej/Qiehhzn/hashtags_for_weddings_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/hUiidn2/xiraxi.pdfIn PDF document text
    • http://bakelenodizaro.iblogger.org/wordpress_contact_form_7_css_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/v7igijc/lock_screen_windows_10_disable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/83160530688.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/fuwekilopujodokaniwaje.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/31667652835.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_15ec359c1d6f434687e49647d44dc3e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/45725738611.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_5325092ec6034a19b36b052b44efd066.pdf?index=trueIn PDF document text
    • http://tusamovukubug.epizy.com/boy_scouts_bear_book.pdfIn PDF document text
    • http://pikovog.epizy.com/the_burnout_society_espaol.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_f5a2f413f95748f1acdd4c98d2c1bdc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevigotu/96116325709.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/tosul.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_f0fd59d0bed341f2abbc0596fe591811.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_8af08e633729410fb03b3654ef7fb528.pdf?index=trueIn PDF document text
    • http://betoxagoropi.epizy.com/dejop.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/devamukifajajutiv.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/project_scope_statement_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/how_to_set_time_in_casio_g_shock_ga_100.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/best_action_games_for_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/90522613633.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 5752 bytes
SHA-256: 331ff1d0d3ffd9e2b102434595ba967e3f4fa7593d2a8d4c9a566254d04c52fc
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 11036 bytes
SHA-256: d132ce90c9aa15c463a5e8e0a82f3e43111933be57f22b4d7761ebe4dda7d3af

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