Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ecf01c7911c01e…

MALICIOUS

PDF

62.4 KB Created: 2020-04-11 21:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec33b02d7642f9db1935c0b7592522e7 SHA-1: 36d3a421e80b9aec4371e782f55b2d5106617615 SHA-256: f9ecf01c7911c01e8390ebb9bb1991293df509671035a41db3156a0f9b6f8e1c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains and appear to be part of a link farm strategy, likely for SEO poisoning or to distribute further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://thesingbabysingshow.com/uploads/1/3/0/2/130273931/130273931.html#1.2diferenciaci%C3%B3n+de+los+sistemas+de+informaci%C3%B3n+en+la+organizaci%C3%B3n+pdf
    • http://superiorlawncare.us/uploads/1/3/1/4/131483153/d3bd10fd.pdf
    • http://mulberrystreetrecords.com/uploads/1/3/1/3/131380755/1277111.pdf
    • http://winaposition.com/uploads/1/3/0/8/130874629/ninogigomiv.pdf
    • http://98citywideinvestments.net/uploads/1/3/0/6/130639350/7060985.pdf
    • http://consensis.nl/uploads/1/3/0/5/130550716/4419737.pdf
    • http://boatshowdeals.ca/uploads/1/3/1/4/131453267/c9854b8bc8d2608.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_off0000cab7.bin
8c106fd7ceca8a054b1238700c623ad8b18bc4002eb360e404743e1cdd3a1ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB7 8804 bytes

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