Malicious PDF — malware analysis report

Static analysis result for SHA-256 660976ac4cedab32…

MALICIOUS

PDF

37.2 KB Created: 2020-04-09 04:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 60169c5e84268d1a776c8a18db4f725a SHA-1: 207a63037453e708e17ae9816979a59021bfc7ab SHA-256: 660976ac4cedab32356362ff7c9c592f8369a4f72b9736ae64bca9e78db792e1
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 point to other PDF files on different domains. This behavior is indicative of a link farm or a method to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious link farm heuristic. No scripts were extracted, but the embedded URLs suggest a phishing or content distribution scheme.

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://lawkeywest.com/uploads/1/3/1/0/131070979/131070979.html#mezcla+de+los+espa%C3%B1oles+e+indigenas
    • http://networkhairinc.com/uploads/1/3/0/6/130605228/9f6a6.pdf
    • http://sportslanguageapparel.com/uploads/1/3/1/4/131453695/9440179.pdf
    • http://newmexicoseo.net/uploads/1/3/1/4/131407102/lanugigetut-kifosafizu.pdf
    • http://yogapsychologycenter.com/uploads/1/3/0/5/130588251/wuzajoliron.pdf
    • http://thebikinisugaringbar.com/uploads/1/3/0/5/130551330/ranefagiguvasem_zekibijekakiv_xadifofisom.pdf
    • http://thesandbox.shop/uploads/1/3/0/2/130288380/f879c12e739.pdf
    • http://saysobeats.com/uploads/1/3/0/8/130814112/saduxurale_bepusopotuzavi_bebimufo_dikox.pdf
    • 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_off0000667d.bin
d5826a67b6376f71db4b82f9755cae850cc166e58ecc9d5f5711d3be735ee1cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667D 9308 bytes

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