Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fc0c2e53945868…

MALICIOUS

PDF

74.1 KB Created: 2021-05-22 03:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d673bfb8c8ec2a385012cfee40421cfb SHA-1: 704b9cb54d99591cad820d153975508b2a7c52ec SHA-256: c0fc0c2e539458687bf6f03f024432a40d1539f38c6bc6f7dc57cbf286ea6790
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 0.9998

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://maypoin.ru/strik?utm_term=reflexive+verbs+english+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485172/normal_6036d434824df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_606adfdebf1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_601324b2cd26c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459318/normal_604d0a9d5cd74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419629/normal_5ff5e83e46cd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_5ff545ba7a0d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_6036a1c71a28c.pdfIn PDF document text
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/6311151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_6048345d06446.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/9724453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_6017992d43570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_606e34eb78134.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/nowokil/40500131669.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/88424675114.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/nisoki.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/how_long_does_developmental_editing_take.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5484 bytes
SHA-256: cc0c5290934956d5768152c48ba92d85dccd4d671495fb18cc7f6f382646fa71
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10824 bytes
SHA-256: 397a1379dd35ae9fd8c1505cd78f772e74f805db93789f6fa22cd29f0f503b15

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