Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff4e3d2176b2382…

MALICIOUS

PDF

72.7 KB Created: 2021-02-17 04:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dff47103ba11d726503c448b9214892a SHA-1: a4493664d49fed84486f3c335efe19c86e07aecb SHA-256: 6ff4e3d2176b23823446f2033ac91ace64716d966f130a8938ee82ee82608342
156 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 0.9996

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 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://crophysi.ru/wix?keyword=a+pragmatist%2527s+guide+to+leveraged+finance+pdf+download PDF link annotation
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/sonin-xeximenikutidel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498842/normal_5ffe1d399d613.pdfIn PDF document text
    • https://xowasesulozuvuv.weebly.com/uploads/1/3/5/3/135347394/xuriw-xoxexugutut-nuzavexozoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5ffc2af4e692d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_5fd26c3362782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5ffbba5a8c001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5ff91b4ad6ed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5ff7d9adddae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_600e1227afea4.pdfIn PDF document text
    • https://zazozoke.weebly.com/uploads/1/3/0/7/130776388/5752453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_6022d746a671e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_600276bedb429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6024c875a94bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_600877d5a5e64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5fc7382fbaa27.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/7b2b2f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fcccfc366e90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5fef024a50c93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_6024acf575198.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/minabiwa/apple_corporate_identity_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/kurukshetra_university_b._com_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/32141529887.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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 5648 bytes
SHA-256: 27078fefbc856d27e5ff0ccbefb7cfabfae79ed78178272d92166f4c6db5a1b4
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 10440 bytes
SHA-256: 36a6f5c10d0a659956a8168ed42fa3dde3e2363431adbadec0d1d953d69f64d9

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