Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4525cfd30733dae…

MALICIOUS

PDF

91.5 KB Created: 2021-02-20 05:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8dae0459e05e65d8ff62b74115d3f7da SHA-1: c3ae302552b4f2377ff1f939a7ddb9401721cad5 SHA-256: f4525cfd30733daea671fcea184b207ac08de7de91ecda420e82e48c0bf1d30d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru', which is also listed as an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure for a 'free download', consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=fe+other+disciplines+review+manual+pdf+free+download In PDF document text
    • http://idealicaitaly.site/vefubozeponiyl8du.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_6003e64f60fa0.pdfIn PDF document text
    • http://moneyindia.site/conair_hair_trimmer_parts7vknv.pdfIn PDF document text
    • http://hugertely.xyz/adobe_sketch_draw_apk0t0g6.pdfIn PDF document text
    • http://vashobereg.com/corrupcion_en_la_administracion_publica_peruevhnb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_602a1ec62dcc8.pdfIn PDF document text
    • http://drenajkrasnodar.ru/battleground_advanced_graphic_tool_bagtohiop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_600f3d2ab893b.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/pidet.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/sasoxarobuzujopubopuzav.pdfIn PDF document text
    • http://wutagokavejeve.rf.gd/denotation_and_connotation_practice_answers.pdfIn PDF document text
    • http://gagelenobom.epizy.com/pest_analysis_ppt_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/audio_recorder_and_editor_apk_for_pc.pdfIn PDF document text
    • http://fubegamo.epizy.com/gegekuzise.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/jumble_answers_for_10_3_19.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_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 5504 bytes
SHA-256: 14a3191cc545adec7c03d9809f51c2f96615ac6565682c17e874f433d8b14158
font_01_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 12064 bytes
SHA-256: e4240c118ac8d8e3b83cc0e69a94b60411fddf1e8daeb49e37466712c0817b84

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