Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ee93cda7acd9a3…

MALICIOUS

PDF

84.8 KB Created: 2021-04-07 08:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2e526d24d899d537097e2f3693e4d612 SHA-1: 8465af029f6080ca294d5a18be68429e74be711e SHA-256: 19ee93cda7acd9a3df6c8fd6de0b1faae7ef8f172c0a839f47d320afe598ec49
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://xajibur.ru/wix?keyword=nc+math+3+released+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5fd97ac926d0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_5febf35e35a21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_600fc86d5b154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_6058a6c45ba75.pdfIn PDF document text
    • https://wanujonoguj.weebly.com/uploads/1/3/1/6/131607110/fuzaxogulefitepex.pdfIn PDF document text
    • http://omynutural.space/1192900372dm8ih.pdfIn PDF document text
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/1b05dde258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fdd35f32fa57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fd80aadee2fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_6052a42b2a991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_606bc70fc3aed.pdfIn PDF document text
    • http://golden-charm.ru/exercicios_de_quimica_organica_nomenclatura_hidrocarbonetos_ramificados2h747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_34afff29e2c3417ab19375c70d3181d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/gevovuwo.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_30e9dda33c4640f4ac357303daf16020.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_cbea5a24971b41d189dfe9e13992f4fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/vezamanuk.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_f51a2073870a4b2b956f8330a1364605.pdf?index=trueIn 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_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 5312 bytes
SHA-256: 484374193a2857efb4550bf6a8a63b340b5e17270ecb261352b4aaf17459ce91
font_01_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 11140 bytes
SHA-256: f743c623d6068b5f537fd615bf5345a3594a8a5ed7414f34f4bad64f23297a9f

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