Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e4d4ec9586811f…

MALICIOUS

PDF

39.3 KB Created: 2020-06-10 12:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3a629f0c4d36e8696b9d6581aefc111 SHA-1: f026180331088756534201602f295a04b2c4279e SHA-256: 05e4d4ec9586811f1e50f1a2d44ebc7e79125db533090042b25ab0ee1c13da7a
156 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links to external websites, many of which are structured as PDF files with numeric slugs, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or facilitate further compromise. The document body, though partially corrupted, contains URLs that align with the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8845474-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8845474-0
  • 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://greencrosshydropedics.biz/uploads/1/3/0/7/130740432/130740432.html#juegos+de+reglas+para+ni%25C3%25B1os
    • http://windrunnerequinesanctuary.us/uploads/1/3/0/7/130776886/sewerojale.pdf
    • http://chiancola.com/uploads/1/3/0/5/130588256/sutaje.pdf
    • http://rgbeats.com/uploads/1/3/1/4/131483245/8580785.pdf
    • http://prototourism.org/uploads/1/3/0/6/130604568/1187815.pdf
    • http://shivrajusa.com/uploads/1/3/0/5/130550973/447700.pdf
    • http://eaconstructionandrepairs.com/uploads/1/3/0/5/130540559/xobobal.pdf
    • http://publicpolicyfellowship.com/uploads/1/3/1/4/131437871/nogij_zodapozumesezir_zadeguxa.pdf
    • http://pavartscenter.org/uploads/1/3/0/8/130814535/3d1379cbfcb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gifamadez.files.wordpress.com/2020/06/34151925423.pdf
    • https://merivotewax.files.wordpress.com/2020/06/34218090083.pdf
    • https://dekabivegu.files.wordpress.com/2020/06/26345321879.pdf
    • https://xunujodir.files.wordpress.com/2020/06/85812195243.pdf
    • https://dogapexajok.files.wordpress.com/2020/06/kawawotojelavejofeno.pdf
    • https://xakisujufo.files.wordpress.com/2020/06/11893048860.pdf
    • https://bamidepe.files.wordpress.com/2020/06/13821819556.pdf
    • https://disepujunipe.files.wordpress.com/2020/06/jivusoxaxavabad.pdf
    • https://jamaxunofum.files.wordpress.com/2020/06/monadovubisagawef.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b2f.bin
cfb299b944a826235d3977d86856052f0fbe5b799f0f9c51b470dda5d2dd9109
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 11212 bytes