Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a780247bad4d6c…

MALICIOUS

PDF

51.2 KB Created: 2020-04-13 08:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 52c035a0133f0faf024ec6377c66ca7a SHA-1: 2ebc2241145480320e75184f8ade97fde9334120 SHA-256: 72a780247bad4d6c34390b89c790d7c6f55cc8e8f88c1f6020658c58e9dcb693
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content under the guise of legitimate documents. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jjbrunner.com/uploads/1/3/1/6/131636781/131636781.html#ejemplos+de+productos+quimicos+organicos+e+inorganicos
    • http://yyzpreview.com/uploads/1/3/1/3/131379041/84bb4b0.pdf
    • http://wvrra.com/uploads/1/3/1/3/131398095/5fccc9.pdf
    • http://boycottedcomau.com/uploads/1/3/0/4/130483558/soputuli_nonevugivixoju_daret.pdf
    • http://lunartouchreiki.com/uploads/1/3/1/6/131607232/koforidiroxad-fasok-nezedenalexi.pdf
    • http://doodadsandfandangles.com/uploads/1/3/0/5/130551585/cc91b.pdf
    • http://renray.net/uploads/1/3/0/2/130288364/ae20db9722.pdf
    • http://natashanatraj.com/uploads/1/3/0/4/130488503/d97b43.pdf
    • http://hearenchantment.com/uploads/1/3/0/2/130271184/xejigazebimugu.pdf
    • http://sosort2019abstract.com/uploads/1/3/1/4/131437107/zotaxevamo.pdf
    • http://lowermytvcost.com/uploads/1/3/0/6/130604083/236152.pdf
    • http://livinglifeonhigh.info/uploads/1/3/0/5/130590219/814795.pdf
    • http://haulbdl.com/uploads/1/3/0/7/130738861/1e0a518ed5c7.pdf
    • http://roamingknowmads.com/uploads/1/3/1/3/131398335/103cbe81ca24a.pdf
    • http://ellemoore.com/uploads/1/3/0/5/130589412/liravib.pdf
    • http://fairbankssnowclearing.com/uploads/1/3/1/3/131381840/ridetoxuvijatom-gorovuv.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_off00009ec8.bin
bd6eee1deb6c101c71c966b5fd52d28db5838573dc4b2db077e791d61b9c25de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC8 8740 bytes

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