Malicious PDF — malware analysis report

Static analysis result for SHA-256 588f5098f13deb41…

MALICIOUS

PDF

33.1 KB Created: 2020-04-09 20:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb2237ac2887e157a424076ee0d4d0bc SHA-1: 6aa250e4771f635ca698930319df56999d78d8c5 SHA-256: 588f5098f13deb419a886d5484134568c6f3218bfb88297521056d148e71a50f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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://camrenewable.com/uploads/1/3/0/3/130313539/130313539.html#in+the+arms+of+an+angel+mp4+download
    • http://thomasxpearson.com/uploads/1/3/0/6/130604689/5328147a0f2580.pdf
    • http://blakemccabe.com/uploads/1/3/0/7/130776434/65b7e668e6025.pdf
    • http://tutorchulacenter.com/uploads/1/3/0/2/130291539/77f12e.pdf
    • http://musicaware.org/uploads/1/3/1/3/131384142/8361727.pdf
    • http://akronareaarts.com/uploads/1/3/1/4/131453623/b273d4e682.pdf
    • http://liamriddick.com/uploads/1/3/0/2/130287886/sinud.pdf
    • http://calacaspoison.com/uploads/1/3/1/0/131070161/4396617.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_off00005b70.bin
5de5ac3d3dd09f7ddda09748dc5e482018cf0ca5c2aaed66540048db49bfbb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B70 7204 bytes

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