Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c530ed63427bc6d…

MALICIOUS

PDF

44.2 KB Created: 2020-03-26 05:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5248690054739c55d81b67c53e764208 SHA-1: 7da7b8da5c8707f66262ac5b359441f3907be712 SHA-256: 0c530ed63427bc6d782eba67bca8b00a391c585c886e25344f46c2c55a1f9c93
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of outbound links suggests a malicious intent to redirect the user to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://michaelhiggins.ie/uploads/1/3/1/3/131379874/131379874.html#why+study+history+john+fea
    • http://kenboyerphotography.com/uploads/1/3/0/6/130620750/3829167.pdf
    • http://defenderpoolservice.com/uploads/1/3/0/6/130605230/5b598.pdf
    • http://tribalethics.org/uploads/1/3/0/8/130874329/dosed.pdf
    • http://bluegrasssecurityspecialists.com/uploads/1/3/0/4/130489363/8a2fdf31.pdf
    • http://shelbyjonesdoula.com/uploads/1/3/0/6/130621574/2eae6ea46e630ab.pdf
    • http://micromulsion.com/uploads/1/3/0/7/130738641/20801f9133f31f.pdf
    • http://goodtimecharlieblog.com/uploads/1/3/0/5/130551585/1000d467.pdf
    • http://aviplan.net/uploads/1/3/0/5/130543874/4984763.pdf
    • http://dragonflytogo.com/uploads/1/3/0/2/130272241/3561159.pdf
    • http://ofisyvarendy.ru/uploads/1/3/0/4/130490461/4293489.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_off00008547.bin
6d00f4be34d38113b0f289d3ff543fba2e7e554b9d75f98facc3377182c0cebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8547 7952 bytes

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