Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f87d69f115a567d…

MALICIOUS

PDF

38.3 KB Created: 2020-05-21 00:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e55a72d177b871b63deeb9591a7ad8ca SHA-1: 6db5c70c8b392a42301a449f64234cd682d8c4e0 SHA-256: 5f87d69f115a567d18400fb91f8eadfe1f7034b6ee9440981bc7b9c57e7a43e4
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as SEO spam or link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a campaign focused on SEO manipulation or phishing, likely using the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dynamic-floors.com/uploads/1/3/1/6/131606875/131606875.html#acquisitions+incorporated+book+release+date
    • http://scoreincph.org/uploads/1/3/1/3/131383813/7949620.pdf
    • http://aawdesignsonline.com/uploads/1/3/1/4/131453610/jezavebubezazobug.pdf
    • http://dogequilibre.com/uploads/1/3/1/1/131164358/wuzawekopevowabozuda.pdf
    • http://whats-the-risk.com/uploads/1/3/1/8/131871685/a0385efc0a.pdf
    • http://5thgradescienceiv.com/uploads/1/3/0/2/130272484/mewaza.pdf
    • http://vilivinggroup.com/uploads/1/3/0/2/130270901/buwenefegivanofujum.pdf
    • http://divorcelawbakersfield.com/uploads/1/3/0/7/130775643/veteruwelawexikowan.pdf
    • http://no-crawl.com/uploads/1/3/1/4/131453213/22e0ee9a14ce73.pdf
    • http://ontariomotorcyclelaw.com/uploads/1/3/0/5/130543366/600106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000694d.bin
5407f8df2a6651a530972c8a0e258c79e6fd7d83467dc84ee4eebbd43f1de6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694D 10836 bytes

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