Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f54e325c5084426…

MALICIOUS

PDF

44.4 KB Created: 2020-04-11 01:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b7cb94a253e113d3f117412d830121f SHA-1: 88049a206410dbd7a15533c17d60c6973bee9992 SHA-256: 6f54e325c508442681990d6d054b5889d3980247b6f6be8949aa897e998fee47
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting an attempt to redirect the user. The ML classifier strongly indicates maliciousness, and the presence of many external links points to a SEO spam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pocolocoonline.com/uploads/1/3/0/6/130604423/130604423.html#skyrim+enb+crash+on+startup
    • http://amberdaniel.com/uploads/1/3/1/4/131453246/7059203.pdf
    • http://diabetesnutritionsystem.com/uploads/1/3/0/5/130541208/4b313a.pdf
    • http://doctors-daughters.com/uploads/1/3/0/6/130620930/638b43d9f.pdf
    • http://frederictonbikeweek.com/uploads/1/3/0/6/130639021/0329821fb29bead.pdf
    • http://superligenergy.com/uploads/1/3/0/5/130588499/bidavawegufazezu.pdf
    • http://www.flancmanfrisch.com/uploads/1/3/0/6/130621024/4372055.pdf
    • http://energydotscanada.ca/uploads/1/3/0/5/130590637/121170.pdf
    • http://pleasantviewphotography.net/uploads/1/3/0/7/130739415/torowajalidavet.pdf
    • http://burroakchurch.org/uploads/1/3/0/6/130621128/bewetusitewitu.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_off00008673.bin
8851c635bf83d0f250df58e50d49bac92a249e65121b89f36555cf60cf185c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8673 8092 bytes

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