Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ece149a0e3848dc…

MALICIOUS

PDF

33.5 KB Created: 2020-04-07 08:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed4fe71ce6c551c659fb4b35032cc337 SHA-1: d57b745d9399ebefcfe61a160102149b9a5ecbf5 SHA-256: 9ece149a0e3848dc2883050abc6a498ae1c1a6e4810c0423832a8246b49366ce
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file. The embedded URLs suggest a link farm or redirection strategy, likely intended to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://quickclosepropertiesllc.com/uploads/1/3/0/7/130740027/130740027.html#timex+wr100m+instructions
    • http://k2ministries.org/uploads/1/3/0/7/130739437/pigufojuk-meredo.pdf
    • http://4kledtech.com/uploads/1/3/1/3/131398351/4259239.pdf
    • http://kayleighjbarber.com/uploads/1/3/0/7/130739583/govinanilev_vebajaxug_disiwezezabak_rewowatol.pdf
    • http://rocklandcountydoula.net/uploads/1/3/0/2/130271139/gifuw.pdf
    • http://naturalchildbirthhelena.com/uploads/1/3/0/2/130291433/nosutodujepil.pdf
    • http://costassolutions.com/uploads/1/3/0/2/130289738/31f6d96d94.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_off00005baa.bin
edfba170700cf382f84ff6bdbf4d49e7bf7d1823cabaaa5a7c3dfe0872c0d872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAA 7784 bytes

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