Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97571d36f6b8d70…

MALICIOUS

PDF

41.4 KB Created: 2020-04-20 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 433c8f9d0a88a49427a9f9e6fe23f764 SHA-1: 0a43d86468f946124c4fa95fea4bc8d6936384a0 SHA-256: e97571d36f6b8d7028321321c0c2d7dffdbeb89a28f2aa653481d0f989ca5803
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The embedded URLs point to various domains, likely serving as landing pages or further distribution points for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pvdphotography.com/uploads/1/3/0/8/130813478/130813478.html#eye+test+report+format+word
    • http://jmdmodern.com/uploads/1/3/0/9/130969879/jijabuxe-jolalogatubu.pdf
    • http://brandandadvertise.com/uploads/1/3/0/5/130588867/ninirewup.pdf
    • http://babypullbar.com/uploads/1/3/1/4/131453855/5410882.pdf
    • http://modisheit.com/uploads/1/3/1/4/131482832/40a7f9c76d8e.pdf
    • http://indepntesnuevaherguijuela.es/uploads/1/3/0/6/130621197/ae277a146f.pdf
    • http://foothilltesting.com/uploads/1/3/0/4/130476564/a014ec.pdf
    • http://mrlawnman.com/uploads/1/3/1/0/131070389/e7de6ceebf2.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_off00007c58.bin
bf347fa4c45ce33320a83f2145eece888fb6dde1671cd2749817aac7fd33b892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C58 7592 bytes

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