Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9572fa38076e441…

MALICIOUS

PDF

91.0 KB Created: 2020-11-23 13:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b9aa2b7b1edd7c743dbfcdad38b07258 SHA-1: 1e12cae8bc1a8168877ae9e9dbcd91a961a32c3b SHA-256: d9572fa38076e4417a7c3f682f547aa8dd742695708a28396e51fde448250d00
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various PDF files hosted on platforms like Weebly and Strikingly. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=biografia+yolanda+chavez+escritora+d PDF link annotation
    • https://kenawogerawe.weebly.com/uploads/1/3/4/5/134593039/vuxid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_5fae98de7b4bc.pdfIn PDF document text
    • https://puramekekekiz.weebly.com/uploads/1/3/4/6/134648744/tizol-meliresego.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/1465253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_5fb6d51c19f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5fbaf6d15684c.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/5683838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f9476c065ab2.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/xozam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5faa317fa8341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_5f9a5918bff6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f9f2da1ef6f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8631ed6c-a52c-456f-9033-89215cde7390/defobuxosidalesesonig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea6c92b-187e-4388-a55c-b1bb3b0c9229/erkrachaputyun_9_lucumner.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012ed8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12ED8 26252 bytes
SHA-256: 48c4c8eb841bf8f0dea8d34ed76a8ffcd27f9c54ae27c3f37ea4098785823dc1
font_00_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 5544 bytes
SHA-256: 58e27735965c69d1e06b4c53de02e656add14954f111a9fa74bc196f312cabd6
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 12344 bytes
SHA-256: 4b6f7b63842f2995eecf3f556bdc5b22f79ce6a47662ed54e4d2554d06d3cca5

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