Malicious PDF — malware analysis report

Static analysis result for SHA-256 7134c6cbdea8f7bf…

MALICIOUS

PDF

43.9 KB Created: 2020-04-19 22:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9f6c0223afbc6a662276ce93cc57422 SHA-1: 20cff5b5d73e760a2a24e674b5188555e7094317 SHA-256: 7134c6cbdea8f7bff6d71892769cf7615e1c895942365916779e27b97a46ba1b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files with numeric slugs, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs indicate a pattern of redirecting users to potentially harmful content, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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 http://kevinyabes.com/uploads/1/3/0/5/130540869/130540869.html#grammar+test+with+answer+key+pdf
    • http://darenie.eu/uploads/1/3/0/5/130544703/d246fb646e9fd.pdf
    • http://awakeningmindbodyspirit.com/uploads/1/3/0/7/130739669/4361590.pdf
    • http://lanniesneighborhood.com/uploads/1/3/0/7/130776085/00471bc4b.pdf
    • http://path2.health/uploads/1/3/1/4/131437005/zogoforobun-neweto-nilopumumorad-ranepa.pdf
    • http://libertypa2016.com/uploads/1/3/0/6/130639495/5508827.pdf
    • http://thepricklypearboutiqueonline.com/uploads/1/3/0/4/130436089/lanajujumibeve.pdf
    • https://ebookpdf
    • http://online.k12
    • http://englishfree.henry.fcusd
    • https://schoolwires
    • http://www.pdfread
    • https://ebookpdf.azargrammar
    • http://willsesl
    • http://www5.pdfread
    • http://hgicschool
    • http://www.Academia.edu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081b0.bin
3177782039112603114f18cc69e5a20e0bc7838bf86fa3b2da603cd31160d14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B0 8988 bytes

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