Malicious PDF — malware analysis report

Static analysis result for SHA-256 117d0d527f47f77d…

MALICIOUS

PDF

30.6 KB Created: 2020-04-04 12:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4a6b06163a462832b5b89671c91d94d7 SHA-1: 15cc429b1bcdc021011141e38ae1af3e6cad78aa SHA-256: 117d0d527f47f77d7f2eb9abe685b76febaa73a60466d3b9a6db982fb0e32d64
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://elainesexperts.com/uploads/1/3/0/4/130435870/130435870.html#kero-sun+radiant+8
    • http://funwoodart.com/uploads/1/3/0/6/130639017/gotugo-vajasabizoje-ginuxu.pdf
    • http://techplusav.com/uploads/1/3/0/6/130621758/tamapajemepo-wajeso.pdf
    • http://lucyskittens.com/uploads/1/3/0/5/130551155/retoxu.pdf
    • http://www.vfwpost612.org/uploads/1/3/1/4/131406108/2092035.pdf
    • http://mysafeheaven.com/uploads/1/3/1/4/131406629/pupuvizijifale_palujewemarunar_fogigib.pdf
    • http://sweetpeaatkinson.net/uploads/1/3/0/6/130621300/witagazisifamep_sogij.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_off00004deb.bin
a2ede4f9a94941102d4efe6b5adf32b8c36a368a497927e90481c991be8f9325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DEB 8052 bytes

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