Malicious PDF — malware analysis report

Static analysis result for SHA-256 744e0ed556837453…

MALICIOUS

PDF

82.5 KB Created: 2021-03-16 08:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d7830a35d7c00c961b48e55f7eb57a19 SHA-1: c594ed4271130d207bf1c11545be3255aa48cb9f SHA-256: 744e0ed5568374535c56b58f9290e8742f4d721c8d1000be15c5e4bd48be7478
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, containing numerous links to disposable hosting domains. The embedded URLs, such as https://kuzutuzo.ru/wix?keyword=nexsmart+d32+user+manual, suggest a lure to trick users into visiting potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a phishing or malware distribution attempt.

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://kuzutuzo.ru/wix?keyword=nexsmart+d32+user+manual PDF link annotation
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/f5726.pdfIn PDF document text
    • http://jewlgems.com/xeleximatajibetejekjae13.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/ctet_answer_key_2020_paper_1_set_k.pdfIn PDF document text
    • https://mojebope.weebly.com/uploads/1/3/4/6/134609081/dedefo.pdfIn PDF document text
    • https://fogisitulen.weebly.com/uploads/1/3/0/7/130775537/70185ba42354cdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fcd53bd61f9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_5feb1e76c8f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5ff14af8a0dea.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/recetas_de_cocina_para_el_ayuno_de_daniel.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/1388326.pdfIn PDF document text
    • http://vulgargirls.fun/website_er_applicationmvzyp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_603d3cc73825b.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/solidworks_manual_download_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448713/normal_5fdf383fb4486.pdfIn PDF document text
    • https://rorefogalo.weebly.com/uploads/1/3/0/7/130776605/8113060.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/bapozomovunigovunowo.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/femoxikafukeme.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/feborobegibew/canossa_college_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/67500628959.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/chandu_film_songs_kannada.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/payback_period_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/bifururilemusasezudo.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_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 5304 bytes
SHA-256: baca2ff959622a6f22d44dc1677904e001dae4d318093ec140912d84fbbcd2b7
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 11196 bytes
SHA-256: ca478f090b3465260b0fe1194ea8ac557b25c9e292020e638fdda154a0c70377

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