Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c2685c7afb8f3d…

MALICIOUS

PDF

30.9 KB Created: 2020-04-12 16:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d88003b28f4c0a738e4829ae0ad5d132 SHA-1: c73a6955f2f90e08616384680065a17636dda6a5 SHA-256: d3c2685c7afb8f3de4a250dd3c4cfa113f8cf62c11320026bda914e1b1c3aec6
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The document body, though partially corrupted, contains text related to a book title and embedded URLs. The ML classifier strongly indicated maliciousness. The primary intent appears to be directing users to a network of linked websites, likely for malicious advertising or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dcflooring.net/uploads/1/3/0/5/130542991/130542991.html#paco+el+chato+libro+contestado+de+espa%C3%B1ol+sexto+grado
    • http://creation-bijoux-nathaliedefleurieu.com/uploads/1/3/0/6/130605111/zojitinogaj_kimofuvudamebu.pdf
    • http://damouretdesucre.com/uploads/1/3/1/4/131453745/limivitefotas-riputono-debir-pafepigex.pdf
    • http://hardinstation.com/uploads/1/3/0/4/130477085/6906707.pdf
    • http://vacationsxm.com/uploads/1/3/0/5/130541846/favizupajadax.pdf
    • http://cmthain.com/uploads/1/3/0/4/130476119/dexomewexupomijo.pdf
    • http://rvl8skibaords.com/uploads/1/3/1/4/131453720/vuxorifewos_lowax_wewobumiruk_vekufagonire.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_off00005062.bin
865af6a2f268f63b26ad7f758f4186ed442df53f518b53be07d74a642568a3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5062 7664 bytes

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