Malicious PDF — malware analysis report

Static analysis result for SHA-256 859c3ed632bd7857…

MALICIOUS

PDF

67.7 KB Created: 2020-11-23 11:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c74803ddf1afa5ffb53ab2da1c340579 SHA-1: 0e1293913b3bf8380d0e53db9d027aa12190f6e5 SHA-256: 859c3ed632bd7857df1d2e2ad2aa7619d56de75a1f5bc17088a5f42ae48eb83c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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://traffine.ru/strik?utm_term=mision+vision+y+valores+de+unidep PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f9477bcd8c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_5f9d3d4109c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_5fad83d22a1d7.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/jivemulitusab-zosezuvawu-deneseseti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_5f9f58307f95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f8c40aa56b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_5fa6d17b343d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fa4ed2d591b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_5f94fc9e74c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f8fcade1bae3.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/jifesu/texas_state_financial_aid_refund.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/86608739173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77d01a1-aa20-4e2f-b1b5-858e46d77dd8/53821398351.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_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 5120 bytes
SHA-256: 8b3bc6ca71c18b1f370a9439a94f03736fad6d8c8b518d427541cb87cbf4443c
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 11848 bytes
SHA-256: 86594c8a364583cfbcddb5f075acf2371c2d04d9eb7de7f031ad60d50c43ec1f

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