Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1581c18b637000…

MALICIOUS

PDF

66.8 KB Created: 2020-11-16 14:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 73d5f8decbd2b0c5c6dd63686dcb0bdb SHA-1: 1681d942b2e0e8438f4c5ee0257f7ca36dd1250d SHA-256: 5f1581c18b637000bd7a4bee0c96244ab90d92a77aba78012cf168060a3d7a44
156 Risk Score

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 0.9997

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://trafffi.ru/123?utm_term=the+flivver+king+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f88e6c494adb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_5fa243d640fb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5fa349e0cba49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_5faa83b907039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5fae2c0e1d194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f92509fe96b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f87f5d6ba0d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_5f9eca3ec78c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_5f8b368584ff2.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/vebuzok-jisotopelipez.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/e7b84f24-6c4d-464d-8a52-97e157ef2331/61023613116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4cb2167-c608-4b09-b2be-7bd4455c686f/lisubo.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_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 4988 bytes
SHA-256: 15909adc9b1a6106455845e838a163f079e241f42143dc51f18a6c60b568c194
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 9616 bytes
SHA-256: 70fa9ff416dbe06bf94c4c34e24ec6f021afc5ec991ee720818814a50fa90caf