Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7698eea9103c6…

MALICIOUS

PDF

54.5 KB Created: 2020-06-01 07:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187cc90007d1d429383de0af529ba0f7 SHA-1: 2ac7fd4b178d668d07d3c94e741cdc48fc1c4b0b SHA-256: fbb7698eea9103c6872f8705d42a844d928f9db7d559b8eb5a38a351d495d47b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious external links points towards a delivery or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://findmybike.us/uploads/1/3/1/6/131606612/131606612.html#pure+testo+xplode+price
    • http://style.v-i.biz/uploads/1/3/0/5/130551266/523b718eb62.pdf
    • http://ginekologjakiel.pl/uploads/1/3/0/4/130435685/67470648bb.pdf
    • http://3rdwavecollaborative.net/uploads/1/3/0/5/130545096/fbc57fc1a5955.pdf
    • https://gubibegal.files.wordpress.com/2020/05/jumufikorerax.pdf
    • https://feguwijagin.files.wordpress.com/2020/05/62674415466.pdf
    • https://wowewuso.files.wordpress.com/2020/06/borerilofopasodajakagu.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_off0000a994.bin
767a18b5a4a7c9411b67390eaf539ef5446c740363063a7e52009e0d5e797a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA994 10992 bytes

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