Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5e2c552f065eae…

MALICIOUS

PDF

36.8 KB Created: 2020-04-29 18:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: b2e8353e419b89944b37a069f2e98e6f SHA-1: 4f4ec1c32c12758565e9430ecfae5ec12bfa7340 SHA-256: ce5e2c552f065eae8f7653cc735c51f9980400f74a78b30aef236500055eae11
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, disguised as a cover letter template. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a coordinated effort to direct users to potentially malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://magnoliahillhoa.com/uploads/1/3/0/6/130603761/130603761.html#cover+letter+template+australia PDF link annotation
    • http://autismdayschool.com/uploads/1/3/0/6/130639312/tovixej-boxigakapuzoda-lukiwemujone.pdfIn PDF document text
    • http://carrotfieldchronicles.com/uploads/1/3/0/2/130272414/gudulurarakudif_wasorebopezan.pdfIn PDF document text
    • http://ncve-taiwan.net/uploads/1/3/0/5/130588278/2d77c392eb4a564.pdfIn PDF document text
    • http://autodidactclub.com/uploads/1/3/0/9/130969030/3295815.pdfIn PDF document text
    • http://musicdepotrocks.com/uploads/1/3/1/4/131437633/6a95529b68.pdfIn PDF document text
    • http://brightwaterentertainment.com/uploads/1/3/0/2/130273740/bfb1de.pdfIn PDF document text
    • http://umamisg.com/uploads/1/3/0/7/130740068/8650380.pdfIn PDF document text
    • http://jeffersonwilliams.com/uploads/1/3/0/4/130490584/vukemovalupoke_vojuvupamalaba_kiped.pdfIn PDF document text
    • http://casinopromotionconsultants.com/uploads/1/3/0/5/130539944/7e2cc.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69DF 7520 bytes
SHA-256: d76a5e0bee74c4b1a1126d88ae1cd7a293009f5a108d58d1a5934d1a9704de7c

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