Malicious PDF — malware analysis report

Static analysis result for SHA-256 66558ddb92fcf1c0…

MALICIOUS

PDF

72.8 KB Created: 2021-04-06 22:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7548831f80d5e60aa4c188aaaafdb474 SHA-1: 5c65006e4db83fa24b80f43e80d370cef1fa2b8c SHA-256: 66558ddb92fcf1c08c2a515b6ae05300a5a00973b0b20686b728814956612553
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable or suspicious domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic material, directing users to external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=calculus+and+analytic+geometry+by+thomas+and+finney+solutions+pdf PDF link annotation
    • http://wowuzarupi.iblogger.org/72834276862.pdfIn PDF document text
    • http://xikimifo.66ghz.com/22563446863.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/subog_damepid_pevoba_kizutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5feb49afd136e.pdfIn PDF document text
    • http://alcozerox.com/xusizelenakukipukodegabag7wcdi.pdfIn PDF document text
    • https://fufigejopugip.weebly.com/uploads/1/3/1/0/131070204/7468476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff06197c2046.pdfIn PDF document text
    • https://naxufagu.weebly.com/uploads/1/3/4/7/134713872/wutebanunijolukibetu.pdfIn PDF document text
    • http://pilawufatazuka.iblogger.org/synthesizer_keyboard_tutorial.pdfIn PDF document text
    • http://givepamodugag.22web.org/52577404099.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/dududi_kevekabebujusar_podapibigefis_suniganutime.pdfIn PDF document text
    • http://newigatop.22web.org/geroremupesogomovugug.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sujunagew.epizy.com/paragraph_transition_words_for_essays.pdfIn PDF document text
    • http://durozebexonadop.rf.gd/apple_iphone_browser.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 5716 bytes
SHA-256: 3138f95c03a8e5f057ecaffc8cebae06956fbb57a5c517683afd0af9747a0822
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 10288 bytes
SHA-256: 83d20805a7221ef84c7b0db0c91fe7ae378f46d1ee34588d08d30d4b745dbf77
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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