Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc3744aeab637d7…

MALICIOUS

PDF

35.5 KB Created: 2020-05-13 06:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f21a7e72b23003aa5f1ee9a0f63f0729 SHA-1: 80a826121f9dbfc3be0aa93969fdf7ec2fa784ea SHA-256: dfc3744aeab637d7904f4f7fbb8dad2f52a69a0466b6ba8e266be64332ac247e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO spam campaign, aiming to redirect users to various external sites. No scripts were extracted from this sample, limiting the ability to determine further malicious actions.

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://starrmark.net/uploads/1/3/1/4/131413418/131413418.html#smackdown+vs+raw+2011+ppsspp+free
    • http://shaneselby.com/uploads/1/3/0/2/130289592/9372937.pdf
    • http://mgsesl.com/uploads/1/3/0/7/130740110/vufototuvuj.pdf
    • http://hhgamericasmeeting.com/uploads/1/3/0/6/130639032/9998354.pdf
    • http://hitvy.com/uploads/1/3/0/5/130546937/9767157.pdf
    • http://lightonmyfeet.com/uploads/1/3/0/2/130272880/6897877.pdf
    • http://edtechjunkie.com/uploads/1/3/1/3/131383770/pezexazem.pdf
    • http://sandiegosportstraining.com/uploads/1/3/1/4/131408864/jefipilonexogugav.pdf
    • http://hotzapia.com/uploads/1/3/0/8/130813979/fodizulokiwuzaw_ruzomexafimu_jajanebo_wuzeleri.pdf
    • http://omniaabdulqadir.com/uploads/1/3/1/8/131856029/c83e1.pdf
    • http://hannahjclancy.com/uploads/1/3/0/6/130604270/5268580.pdf
    • http://graceorrell.com/uploads/1/3/0/5/130589331/jefur_kitepes_xijovizakoten_kudovinem.pdf
    • http://oranurse.net/uploads/1/3/0/7/130739540/telobedideno.pdf
    • http://desertpoppy.net/uploads/1/3/0/5/130551103/773fb10985e.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_off00005cd6.bin
a9234f312bfb2e656b48d558319545b059cbab7439b2766b1100ae40cd5b4883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD6 11296 bytes

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