Malicious PDF — malware analysis report

Static analysis result for SHA-256 92aa937ff2ef6860…

MALICIOUS

PDF

35.4 KB Created: 2020-06-02 21:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1f76664fa5bc2ebd45d5bb9cc840dbf SHA-1: 151c80a4a073a2f97d1f130580dd7db7ed66941d SHA-256: 92aa937ff2ef68606ff7efd67030e33ee9f4e365f24215d998becd93cf7c5c0d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. The primary URL http://4nk.undesirable.us/uploads/1/3/0/7/130776267/130776267.html#big+fernand+bastille and other similar URLs suggest a coordinated effort to direct users to potentially malicious or deceptive content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://4nk.undesirable.us/uploads/1/3/0/7/130776267/130776267.html#big+fernand+bastille
    • http://nononsensecleaning.net/uploads/1/3/0/6/130639867/3758850.pdf
    • http://romanceassistantevent.com/uploads/1/3/0/6/130620840/c2697.pdf
    • http://trumanssociology.com/uploads/1/3/0/5/130588513/9729841.pdf
    • http://4nk.undesirable.us/uploads/1/3/0/7/130776267/terms.html
    • http://4nk.undesirable.us/uploads/1/3/0/7/130776267/dmca.html
    • http://4nk.undesirable.us/uploads/1/3/0/7/130776267/policy.html
    • https://kigedor.files.wordpress.com/2020/05/24718057921.pdf
    • https://taguvef.files.wordpress.com/2020/05/biravadu.pdf
    • https://rezitofu.files.wordpress.com/2020/05/44242558688.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_off00005739.bin
545f4aaf0d9ea0b58c9293fd06af877093af243825e05ea4a44d035f1af32df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5739 14320 bytes

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