Malicious PDF — malware analysis report

Static analysis result for SHA-256 1172565153a8049e…

MALICIOUS

PDF

29.6 KB Created: 2020-05-16 09:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ff2da264f8498ac4dcb5c12b8a8f27 SHA-1: 61803cf7d541d7f97df304b6d0d41cbbc8bfc30d SHA-256: 1172565153a8049ea89dd5a82ea51d15a85c1a882fec7015a45c1bc51c4eab85
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links to other PDF files hosted across various domains. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely for SEO spam or to distribute further malware. No scripts were extracted, but the sheer volume of outbound links suggests a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thekcgroup.net/uploads/1/3/1/4/131482975/131482975.html#coconut+tree+hd+wallpaper
    • http://solucionesacabados.com/uploads/1/3/0/2/130287257/e483646c8.pdf
    • http://minnesotabankingcareers.com/uploads/1/3/0/5/130551718/7b67f53dac2.pdf
    • http://newjerseybankruptcies.com/uploads/1/3/0/7/130739275/rulilaj.pdf
    • http://pgelectricalsolutions.com/uploads/1/3/0/6/130605012/nurakorenuwakuv.pdf
    • http://streetsanddrinks.com/uploads/1/3/0/5/130589191/bf2eb09014.pdf
    • http://aggressivedrivingclub.com/uploads/1/3/0/7/130740258/tagesop_lozawinemi.pdf
    • http://lambeauandlouis.com/uploads/1/3/0/7/130738779/debiniwamumek-boparajasup-fadiwerul-talamikarire.pdf
    • http://robeisnermusic.com/uploads/1/3/1/4/131452840/pozov.pdf
    • http://neuracing.com/uploads/1/3/0/4/130489363/foruwulobazefazugoz.pdf
    • http://mdmulticultural.com/uploads/1/3/0/4/130483957/95c89178b3d0ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00004a93.bin
f3913b93f7e7c80b512f0f51420df476cf4bd092c4c69fb3e729406e82bdd9be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A93 9640 bytes

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