Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb85aaf96829b3a…

MALICIOUS

PDF

84.0 KB Created: 2021-06-06 22:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 91c0555ae500c43ad2b394672b9ae093 SHA-1: acd48cac5da0b609d48bded3e77b3823a7aaf463 SHA-256: 3bb85aaf96829b3a62015aca7d5a0a1ab82db39bbad0cce49c64c92545820ff1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this is a phishing or malicious document. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=debenture+interest+paid+balance+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413346/normal_6056268b35b13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473039/normal_6006ea9e5f615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_606e6f19c7732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_601a3b4847c68.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/8313376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5fe8a55419e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390081/normal_6005173a499d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_60b97f54d7479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_606e28d5aa98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_60111e4eb148a.pdfIn PDF document text
    • https://kimidagox.weebly.com/uploads/1/3/4/4/134470984/7356548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_603101c1cc5d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fec811c28ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fe97e1bbefa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fdd6ea74afc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383452/normal_5fe51d4fd314a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383146/normal_600223cb504ff.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/6074118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_605597772abd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385633/normal_6003af61c6b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_6038fe9665dc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcdafc248e42.pdfIn PDF document text
    • https://kixesikanunezez.weebly.com/uploads/1/3/4/7/134702505/tamero_tofasupasoso_mufazuzexobi.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://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_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 5072 bytes
SHA-256: 7ac876533b7e7af1f781cc8ccd654713505068706bc294fb96507aafc5d6af29
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10516 bytes
SHA-256: c0c5d093691d2ca7da9e87ad676f8dfa34683619d4907064efc213c5e0cbcb3d
font_02_sfnt_off0001341c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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