Malicious PDF — malware analysis report

Static analysis result for SHA-256 718690b25e61a76e…

MALICIOUS

PDF

36.0 KB Created: 2020-04-19 22:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8a4374a54b639c75bb5836d3f46fc51c SHA-1: 71e0856dfb6789730337184eee1e7e0b9c994a45 SHA-256: 718690b25e61a76e247facfee94f0e32f42f61449657cd8c2028d7b99e5988b6
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the structure suggests an attempt to redirect users to potentially harmful websites.

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://retrobikesdublin.net/uploads/1/3/1/4/131437750/131437750.html#bsplayer+apk+old+version
    • http://tamaraleksandr.com/uploads/1/3/0/7/130738755/wuxun.pdf
    • http://xn--ou-e-6pa.com/uploads/1/3/0/4/130476511/9827878.pdf
    • http://uncwsae.com/uploads/1/3/1/6/131606789/rojitabalowakatumix.pdf
    • http://comme-a-la-maison-arras.com/uploads/1/3/0/5/130550723/2544698.pdf
    • http://iidealhomes.org/uploads/1/3/1/3/131398473/sevotowewamobitam.pdf
    • http://asset-financing.com/uploads/1/3/0/6/130605190/30856531e8.pdf
    • http://freezetolerantballvalve.com/uploads/1/3/0/6/130620278/bcf017122bfcc.pdf
    • http://thewheelplug.net/uploads/1/3/0/2/130289397/bisefadojiw.pdf
    • http://ahorseconnection.org/uploads/1/3/0/3/130379743/9429441.pdf
    • http://ilsantero.com/uploads/1/3/0/6/130622089/9984110.pdf
    • http://yourcesportfolio.com/uploads/1/3/1/3/131398177/60c03540b6a.pdf
    • http://ilevel-up.net/uploads/1/3/0/4/130489499/f4e486675.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_off000061a8.bin
17e0077a3037b76ea3366002a76f68b8b05ea2a8b8dded29ef7809ceeb4ed83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 9020 bytes

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