Malicious PDF — malware analysis report

Static analysis result for SHA-256 146f840c6fa6ae0c…

MALICIOUS

PDF

37.4 KB Created: 2020-04-13 07:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad63f9fbf8f0ce5bd7d94168dd16e524 SHA-1: 9798e7b0cceab03b0140620ee969e786fe7b254b SHA-256: 146f840c6fa6ae0c2f1f21cc26689b9ee822a95b91f91900f10d938897cf6067
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicating a link farm designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches one of the extracted IOCs, suggesting an attempt to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rubydoocookies.com/uploads/1/3/0/6/130639777/130639777.html#razon+de+cambio+y+pendiente+de+una+recta+ejercicios+resueltos
    • http://yllindachen.com/uploads/1/3/0/6/130621300/gemuv_xuxowofuzojeteg_furukilemiwip.pdf
    • http://orientaltaste777.com/uploads/1/3/0/6/130604551/tadaku-ginoxosune-vodubo-rotutipetuzu.pdf
    • http://whittenwool.com/uploads/1/3/1/4/131482933/najesafelijeb.pdf
    • http://luckys214fc.com/uploads/1/3/0/3/130323196/xamosum.pdf
    • http://pettreemusic.com/uploads/1/3/0/6/130605291/61ff553.pdf
    • http://specializedkinesiology.org/uploads/1/3/0/2/130289502/bowuwix.pdf
    • http://naturesbeautysc.com/uploads/1/3/0/5/130590374/c9daef5beba352b.pdf
    • http://talberkovich.net/uploads/1/3/0/5/130550667/49b80c.pdf
    • http://hayesrobertson.net/uploads/1/3/0/6/130620266/jeminopive.pdf
    • http://goffmarket.com/uploads/1/3/0/5/130543874/lumezulitogazu.pdf
    • http://jdfurniturerepair.com/uploads/1/3/0/7/130739519/5fbd07c412.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_off0000662b.bin
eaa9f58bfd741ebcc977cb95733091f1fa3ce7fba843b930b687e40ab034ac35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 9124 bytes

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