Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcacac09f8cfb55…

MALICIOUS

PDF

52.5 KB Created: 2020-05-22 11:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 3d05ddb4e2b8b4d662a5d99f32bbce15 SHA-1: 00ebe4de8ae5f985cf810b3ce963b9744d363428 SHA-256: 1fcacac09f8cfb55327f6c29c9682b335f426a1ac2328ed03df4320b095b5585
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, http://xinliyulekaihu.br3h.com/uploads/1/3/1/4/131438464/131438464.html#black+sabbath+torrent, suggests a potential lure or theme for the malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document's structure and numerous outbound links suggest it is designed to redirect users to potentially harmful content or facilitate SEO spam.

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://xinliyulekaihu.br3h.com/uploads/1/3/1/4/131438464/131438464.html#black+sabbath+torrent PDF link annotation
    • http://xdgarchitecture.com/uploads/1/3/0/6/130604370/4239065.pdfIn PDF document text
    • http://rusticlegacy.com/uploads/1/3/1/3/131379477/1798947.pdfIn PDF document text
    • http://ledgertax.com/uploads/1/3/1/4/131453695/najuk.pdfIn PDF document text
    • http://prepareporium.com/uploads/1/3/1/4/131453665/bf6e3d.pdfIn PDF document text
    • http://belgitours.com/uploads/1/3/0/2/130289339/00ad2f2813ce74.pdfIn PDF document text
    • http://ralphgarciapa.com/uploads/1/3/0/4/130475959/jolalipitoxe.pdfIn PDF document text
    • http://paintforpink.com/uploads/1/3/1/3/131379832/9227836.pdfIn PDF document text
    • http://jamesmchaffieclimbing.com/uploads/1/3/0/6/130620822/fd6f40d03.pdfIn PDF document text
    • http://dawn-hudson.com/uploads/1/3/1/3/131383386/7560896.pdfIn PDF document text
    • http://eleftheriadoukallia.com/uploads/1/3/0/8/130813314/vosulojo-kodegizuku-meruneb.pdfIn PDF document text
    • http://manfredocamperio.it/uploads/1/3/1/8/131857204/1120ae42b4458.pdfIn PDF document text
    • http://danielmavalyantsmusic.com/uploads/1/3/1/1/131164447/3e5744e.pdfIn PDF document text
    • http://leplaisirdevendre.com/uploads/1/3/0/6/130604696/c19a1eee.pdfIn PDF document text
    • http://alternativeholisticwellness.com/uploads/1/3/1/4/131406811/gevoriviw.pdfIn PDF document text
    • http://twonineteennaturals.com/uploads/1/3/0/5/130539170/bumovabifixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA289 10676 bytes
SHA-256: 72d90b41c6d33026ad0c9487370d06287579767eafa198b69a34c2d18a132818

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