Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2909e3d6a62ac1…

MALICIOUS

PDF

34.9 KB Created: 2020-05-31 22:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a1c052f38d022542022584f732adab SHA-1: a6175ae7848d6814911db502ab1548ac4d6d7d30 SHA-256: ac2909e3d6a62ac1b27811d129d1b40b0b2c1bff0264331b812a4855030c17a6
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to WordPress hosted PDFs, which is indicative of SEO spam or a link farm. One of the extracted URLs, http://nikkileon.de/uploads/1/3/0/5/130539849/130539849.html#peroxide+forming+chemicals+list, appears to be the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent behind the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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
  • 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://nikkileon.de/uploads/1/3/0/5/130539849/130539849.html#peroxide+forming+chemicals+list
    • https://razekusokil.files.wordpress.com/2020/05/3309467774.pdf
    • https://kakonowa.files.wordpress.com/2020/05/sesupeju.pdf
    • https://boduwifa.files.wordpress.com/2020/05/37021424208.pdf
    • https://vebujeko.files.wordpress.com/2020/05/papiwenubajezefurep.pdf
    • https://dasawiduved.files.wordpress.com/2020/05/kixenuxajozekuxuvifoxoj.pdf
    • https://kikibok.files.wordpress.com/2020/05/fizipuxudedikebewafa.pdf
    • https://xilogip.files.wordpress.com/2020/05/68893499190.pdf
    • https://vimolor.files.wordpress.com/2020/05/difutoxevobanolokuruximar.pdf
    • https://bemurates.files.wordpress.com/2020/05/porababuzimifovojiputodel.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_off00005f44.bin
53db3147c7b3b0614c4b426ff35140cf70832c8eb92bd4d6dfbb83bc88377c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F44 9800 bytes

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