Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e7231d357263fc…

MALICIOUS

PDF

37.1 KB Created: 2020-04-06 10:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e8249617a8c1c8c24ce3e8485ec8f22 SHA-1: b59af1038d6ba61c1b5d2023efae96ca7faccb06 SHA-256: 81e7231d357263fcaeaf0b7c0d3622c7c292b8e9168f6cb5a4ae08e792f52c8e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains. This suggests an attempt to manipulate search engine results or distribute further malicious content through a network of linked documents. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

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://fulinkaifulak.com/uploads/1/3/0/5/130551176/130551176.html#dominio+y+rango+de+una+funcion+cuadratica+con+radical
    • http://globalleadershipventures.com/uploads/1/3/1/3/131384240/fc248.pdf
    • http://paradeon.net/uploads/1/3/1/1/131164198/6595386.pdf
    • http://ns2rebel.com/uploads/1/3/0/6/130604240/6200045.pdf
    • http://hcjournalism.com/uploads/1/3/1/4/131482850/20f4f554bdff1.pdf
    • http://wildernessfamilies.org/uploads/1/3/1/3/131379541/podow-mixadosereli-xovodikexegobe.pdf
    • http://acmehydrox.com/uploads/1/3/0/5/130539125/9522ea.pdf
    • http://veteransignworks.com/uploads/1/3/0/7/130775396/604239.pdf
    • http://cheyenne-nailsandbeauty.ch/uploads/1/3/0/7/130739315/5890230.pdf
    • http://milledlogs.com/uploads/1/3/0/9/130969808/vavakilolurab-sevubibakimel-lurusafu-matusiwimoju.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_off00006a38.bin
c323e9b158196d2b5c764e9dd44151ba14d38fa415ce0e78cc5be54883d91ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A38 7624 bytes

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