Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc3c22f705a636d…

MALICIOUS

PDF

34.3 KB Created: 2020-06-05 03:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e00d1fe137ac503c81651b3c0c92d51 SHA-1: 4743710db4dd3b49f5c3040307bd8a55a0574569 SHA-256: 5fc3c22f705a636da1e4f4f8f8c7b1ffed8537d6b137d1946ae9433c0c4669d7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF and HTML files. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be the distribution of a large number of links, potentially to manipulate search engine results or to serve as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://openhouseprequal.com/uploads/1/3/1/4/131453046/131453046.html#garden+shed+plans+10+x+14
    • http://smokescigarclub.com/uploads/1/3/0/5/130546717/tufujemogosero-toviwal-sesitowewexopis-guvobonite.pdf
    • http://alienmommy.com/uploads/1/3/0/3/130323515/semukigodisezuge.pdf
    • http://muscleheadstudiosllc-art.studio/uploads/1/3/1/4/131453720/e685281a17b1ed.pdf
    • http://onelegalaccounting.org/uploads/1/3/1/8/131856518/mugukuxi-fodaxewu-vewigifu.pdf
    • http://rshrenovations.com/uploads/1/3/0/3/130323181/d05151f75b.pdf
    • http://openhouseprequal.com/uploads/1/3/1/4/131453046/terms.html
    • http://openhouseprequal.com/uploads/1/3/1/4/131453046/dmca.html
    • http://openhouseprequal.com/uploads/1/3/1/4/131453046/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dadisegikew.files.wordpress.com/2020/06/21836843292.pdf
    • https://nibijolor.files.wordpress.com/2020/06/tulotalikeve.pdf
    • https://gepefej.files.wordpress.com/2020/06/20976173642.pdf
    • https://fesofovajov.files.wordpress.com/2020/06/70649897872.pdf
    • https://vagiseni.files.wordpress.com/2020/06/jujotijaradogitek.pdf
    • https://ladisipe.files.wordpress.com/2020/06/20180091486.pdf
    • https://fulazetula.files.wordpress.com/2020/06/12620593346.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c66.bin
01d84ac5dcb4cbfc4bb001713a9865586cfceafd74c9c21ef1993a37389079ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C66 9796 bytes

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