Malicious PDF — malware analysis report

Static analysis result for SHA-256 4473347b06e82f03…

MALICIOUS

PDF

65.3 KB Created: 2021-06-06 15:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0302c5163de6db7c80c22d9ef5570b1d SHA-1: 18b08be2c9035765b9afc00eb053a51923eca45d SHA-256: 4473347b06e82f030ca509dcef301598caa67a0ed3c07d44315099afa68bfae6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to other PDF files hosted on various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive linking suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

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.
  • 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
  • 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://pistant.ru/pbw?utm_term=class+12+chemistry+ncert+book+pdf+download+byju%2527s PDF link annotation
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/konawotagejilugixam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff5a1e777d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_60477b0feb4f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_6008dd04e4533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_5fe04fa12fee9.pdfIn PDF document text
    • https://lezexoxutipeb.weebly.com/uploads/1/3/4/4/134462335/35ebb34480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_603a7c8a0f845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_602cfdf1a9983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_603e44476460d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_6000c2ca5de45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_6054628b869dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_60ba4a677af01.pdfIn PDF document text
    • https://badikixokatapi.weebly.com/uploads/1/3/0/7/130739740/xazijudomawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_603335f288410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_604aff069a22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_60468949c86c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6034c3a0b9ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_605cb1a23bbe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_6064cc76d6560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5ff49a57d1848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457577/normal_5fdea1483b001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozevupegufi.pbworks.com/f/84782965128.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/nojidejexogosuxax.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144527418/what_day_does_walmart_restock.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 5992 bytes
SHA-256: 03708ea601b96dcb0a478cd4df130c46a2b9128f2680b9d32cc27879db9227b0

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