Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd55bc06bb3cd109…

MALICIOUS

PDF

34.6 KB Created: 2020-04-12 15:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f21a42039bfd1959d4be9acd40a9435 SHA-1: 37554ebaf36cb195fde2d80d9c82b76eda9faa05 SHA-256: cd55bc06bb3cd109b3f88c438fffbe8aca46760bc4fe22c94dd0106ec7d726dc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to host malicious content or redirect users. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting a deliberate attempt to lure the user to a specific resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dibintibalongoenterprise.com/uploads/1/3/1/3/131384229/131384229.html#seeley%27s+principles+of+anatomy+and+physiology+2nd+edition+pdf
    • http://imcov.org/uploads/1/3/0/4/130488217/ximunugotu.pdf
    • http://nadeemhussain.info/uploads/1/3/0/6/130603988/9107826.pdf
    • http://demingradio.net/uploads/1/3/1/4/131437848/b29f5a72.pdf
    • http://organicbrandsolutions.net/uploads/1/3/0/5/130539243/munemidi.pdf
    • http://diegoandjulie.info/uploads/1/3/0/4/130435622/8790824.pdf
    • http://nicolehebdo.com/uploads/1/3/1/4/131453907/zaxebukab.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_off00005f2b.bin
3ce2df3d5b9056d948ad3c65aaf4f1f6a533221073b24f9da95fc19f858204ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2B 8024 bytes

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