Malicious PDF — malware analysis report

Static analysis result for SHA-256 9912e3b6b0896967…

MALICIOUS

PDF

37.0 KB Created: 2020-04-11 04:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e88837f67e9df0683398c4a31641d76 SHA-1: 3e30c2f3bc1aca631da5c4c838fe60f353b0dcf0 SHA-256: 9912e3b6b0896967a3fddd5600d92d3f2e996d07e64a2a8487da60edcd8c5a22
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm designed to host malicious content or distribute malware. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://brettsimper.com/uploads/1/3/1/0/131070379/131070379.html#nms+2000+download
    • http://servicedirect.org/uploads/1/3/1/4/131483112/kagop.pdf
    • http://knipimperium.nl/uploads/1/3/0/8/130874076/wezupu.pdf
    • http://greatcubicleescape.net/uploads/1/3/0/7/130740498/wewareguxepi_doleto_ramusapeso_tavutelulurita.pdf
    • http://shivasdelights.com/uploads/1/3/0/2/130289800/baa0775.pdf
    • http://apg-security.biz/uploads/1/3/0/6/130640126/0c0cddbe01265a5.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_off0000622d.bin
e66e4b39cbc9682c7b0784b1af75e6b560fdbf65b3f4a99dfc3a0f4ff0deb12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622D 9900 bytes

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