Malicious PDF — malware analysis report

Static analysis result for SHA-256 970362b8daa10220…

MALICIOUS

PDF

33.8 KB Created: 2020-05-31 13:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3545b37a6cceae7bd50c99fc11a53158 SHA-1: fa4f5fc83fa531e2e0e6d2f42a2582fec6d75a1f SHA-256: 970362b8daa102201540edd2cf191d5fc3b7cadb337fd5cc1b7d37ca3bcef4f6
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on WordPress.com. The ML classifier also strongly indicated maliciousness. The primary URL http://kelseyandmichael.rominastiebenphotography.com/uploads/1/3/2/3/132303118/132303118.html#pnl+livros+pdf appears to be the entry point for this link farm. No scripts were extracted, but the sheer volume of outbound links suggests a content-luring or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kelseyandmichael.rominastiebenphotography.com/uploads/1/3/2/3/132303118/132303118.html#pnl+livros+pdf
    • https://vasoponox.files.wordpress.com/2020/05/sigud.pdf
    • https://gosigisor.files.wordpress.com/2020/05/72747689372.pdf
    • https://vimolor.files.wordpress.com/2020/05/difutoxevobanolokuruximar.pdf
    • https://gosigisor.files.wordpress.com/2020/05/vewawadifurorebemeka.pdf
    • https://xanojebukeki525275366.files.wordpress.com/2020/05/puguvepedivovizokefepa.pdf
    • https://wutatume.files.wordpress.com/2020/05/16236107204.pdf
    • https://wenajaxapat.files.wordpress.com/2020/05/10524339451.pdf
    • https://mozabowo.files.wordpress.com/2020/05/57943300122.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_off000055ba.bin
d55c7a8b42b97e36a766eeb3a16f42f4179d6abf50872309d802a4eb5f8994ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BA 12420 bytes

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