Malicious PDF — malware analysis report

Static analysis result for SHA-256 37af28ba09d9b95c…

MALICIOUS

PDF

41.4 KB Created: 2020-04-03 15:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a74cba90a5698424ff47c6967071c1a SHA-1: 278ee8a8ac05ec32b980a823d7b8a34d5e26eaa6 SHA-256: 37af28ba09d9b95c7b9d4705ba29976d9a9098fb7a8dc4505a3c347e934f2fb0
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, many of which follow a similar numeric or slug-based URL pattern, suggesting a coordinated effort to distribute content or redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation that these links are part of a malicious scheme, likely for SEO manipulation or to serve as a gateway to further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://subienation.com/uploads/1/3/0/7/130738528/130738528.html#the+progress+of+love+the+meeting
    • http://creativespiritzlimited.com/uploads/1/3/0/6/130620929/budobuxetafeb.pdf
    • http://angelhomebiz.info/uploads/1/3/0/5/130588443/kilezejopa_pirud_kapar_gokabadabexu.pdf
    • http://odonatahealthwellness.com/uploads/1/3/0/7/130775992/3a92e.pdf
    • http://amandacaseyamos.com/uploads/1/3/0/7/130740177/runikerevufax_powixotid_xigufaf_xuwomomuv.pdf
    • http://thecoolclear.com/uploads/1/3/0/8/130814195/lipapinuzojotegidar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650d.bin
2e8f9c0fc01d835c69f70c480e2db4286abceafb6b58c6f277ed9e27c57008a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650D 7752 bytes
font_01_sfnt_off00008376.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8376 16204 bytes

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