Malicious PDF — malware analysis report

Static analysis result for SHA-256 634415a6299be4a2…

MALICIOUS

PDF

38.4 KB Created: 2020-04-08 09:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bfd6f27b7c855b74aacbcc1f7c03064a SHA-1: 6e40180f64474e606bb69a071777e53850b710b5 SHA-256: 634415a6299be4a29d3a7c7acb7cd5e2666804fc9ababf43843bb8521e2f1538
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, identified as a 'PDF SEO LINK FARM' heuristic. The primary external URL points to a page that also contains a link to a PDF file. The ML classifier strongly indicates maliciousness. The document's purpose appears to be directing users to a network of external sites, likely for malicious SEO or to host further malicious content.

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://kjmatosservicecorp.com/uploads/1/3/0/4/130488415/130488415.html#10+palabras+con+la+letra+g+al+inicio PDF link annotation
    • http://jennifergasser.com/uploads/1/3/0/6/130621916/3985025.pdfIn PDF document text
    • http://allcontent.shop/uploads/1/3/0/6/130604427/ritawozipujub-semarez.pdfIn PDF document text
    • http://ansgarmueller.com/uploads/1/3/0/2/130289711/tulofumoxadedadizagu.pdfIn PDF document text
    • http://nchonorflight.org/uploads/1/3/0/6/130620838/pajonipuf_mowizadunakamo.pdfIn PDF document text
    • http://equippum.com/uploads/1/3/0/7/130740530/konewal.pdfIn PDF document text
    • http://congerwestinteriors.com/uploads/1/3/0/6/130639165/1739147.pdfIn PDF document text
    • http://stilemans.com/uploads/1/3/0/5/130551859/wovusuv-mifelazimo-pigilezotazeku.pdfIn PDF document text
    • http://sweepthebeach.org/uploads/1/3/0/5/130588506/pogofajugit.pdfIn 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d10.bin
44de20200ace85f7dddd0507bf816e98fe6adeec2ebe38c9cb1db27cd97b2219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D10 8420 bytes

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