Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b4b619bd05f644…

MALICIOUS

PDF

29.8 KB Created: 2020-05-29 12:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db121ef41a1b0b4127b58a94067a3e4b SHA-1: f4fbd00c9c6f8d5c97de8799a3080f0a1f6f6994 SHA-256: e2b4b619bd05f6440185582fe85461ce5c1e1a273aab74088afd1ca582fb05e2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, limiting the ability to determine specific payload delivery or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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://plalis.com/uploads/1/3/0/5/130547846/130547846.html#dairy+queen+peanut+butter+cookie+dou
    • http://reliabletrust-translations.com/uploads/1/3/1/4/131453256/nanugetom.pdf
    • http://ptsdrelieftv.com/uploads/1/3/1/3/131381840/luromotofutez-lemit.pdf
    • http://underdogchamps.com/uploads/1/3/0/8/130874154/senifipik.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_off0000489a.bin
f6b073e1e00cf363e6cf8ee2841854a05013d26e056830b04e0c83e2da83fcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x489A 10580 bytes

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