Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb3adfd43d409a6…

MALICIOUS

PDF

36.4 KB Created: 2020-04-04 12:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa63422faf4c75adbbf70a8ccf9de4ff SHA-1: 59fbf8d85f96eb3525aa182669d3aaab379d3def SHA-256: fcb3adfd43d409a69482a3640db31e6c8dbdff3ddd4c6e79eff0d09207aed98b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF documents hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious or low-quality content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oldkingpartners.com/uploads/1/3/0/3/130323814/130323814.html#que+es+razonamiento+inductivo+en+espa%C3%B1ol
    • http://buywoofandbrew.com/uploads/1/3/0/4/130489499/pokova-wevejogunexuda.pdf
    • http://artisandesignsource.com/uploads/1/3/0/2/130273735/losawi_lekiza_femitoxukuwut_xuduf.pdf
    • http://southerncutterslawncare.net/uploads/1/3/0/2/130289218/fd650bdffd.pdf
    • http://roottoriseconsulting.com/uploads/1/3/0/8/130814178/ff23ad3.pdf
    • http://conroelawncare.com/uploads/1/3/1/4/131452876/8321874.pdf
    • http://www.mcgarveyservices.com/uploads/1/3/0/5/130543173/6599042.pdf
    • http://janiceyu.com/uploads/1/3/0/5/130551237/40ba1a71b3.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_off000063a8.bin
266cef701297dbb0140b08ec1afd9314e724b1b98ac5c8454e0d2834d85e91e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 8512 bytes

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