Malicious PDF — malware analysis report

Static analysis result for SHA-256 058595872f531852…

MALICIOUS

PDF

35.2 KB Created: 2020-04-04 12:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f7d94b7a418ebfe0a12c0b81df6cd7f SHA-1: d66a44b64d203d553c6fe17f3ffe2432ace9acf4 SHA-256: 058595872f531852cc1a061ec182838b5acca3d5ebad56eb080280a26522c0c3
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, indicative of a link farm or a distribution network. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a coordinated effort to redirect users to potentially harmful content, possibly for SEO spam or to serve further malicious payloads.

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://befreetherapy.com/uploads/1/3/0/2/130289339/130289339.html#os+verbos+transitivos+indiretos+s%C3%A3o
    • http://tanyaszommer.info/uploads/1/3/0/3/130313790/lisorajawegejug.pdf
    • http://gibydarcy.com/uploads/1/3/0/5/130541623/f1765d24ca.pdf
    • http://nadineandcompany.com/uploads/1/3/0/5/130539373/3497982.pdf
    • http://run-u-nut.org/uploads/1/3/0/3/130379596/dowabivetobum.pdf
    • http://gravelroadconcerts.com/uploads/1/3/1/4/131406827/baxafosonesasirado.pdf
    • http://inogenone.de/uploads/1/3/0/3/130323656/waxutunebiwo.pdf
    • http://mail.oneontapubliclibrary.org/uploads/1/3/0/5/130588511/d68732dea33b8.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_off00005d45.bin
7fecdf20a2aa2ea9ae59e6a3d4800df5e0687598e4d1ce1f072e94e43f3ae69b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D45 9844 bytes

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