Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b205c041af09cd…

MALICIOUS

PDF

45.6 KB Created: 2020-03-29 11:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b4c69baa621a74a1c2e747ac8fe57944 SHA-1: 9cd46b6651c4eac5f29be8b8803e6170f65cc271 SHA-256: 61b205c041af09cdd1be83b9c3ffcdb95004d1f61b88a79bb60152fd427375a2
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, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure or a distribution point for further payloads.

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://qualitycareafh.com/uploads/1/3/0/7/130739144/130739144.html#ozeri+food+scale+near+me
    • http://aviplan.net/uploads/1/3/0/5/130540017/28f0b.pdf
    • http://thepurestseed.com/uploads/1/3/0/7/130775557/kipoz.pdf
    • http://celldoctorsfarmington.com/uploads/1/3/0/8/130814353/8443463.pdf
    • http://coltschrader.com/uploads/1/3/0/7/130776745/1700706.pdf
    • http://kestrynscove.com/uploads/1/3/0/7/130775607/fupesisoxejit.pdf
    • http://teachersinmotion.com/uploads/1/3/0/5/130551729/pibugifiz.pdf
    • http://thesepsisproject.com/uploads/1/3/0/6/130622049/dulavogivowivi.pdf
    • http://heartandhomebeartraditions.com/uploads/1/3/0/5/130542773/gutekubagetox-daxisogexirun-xemit.pdf
    • http://joej1990.com/uploads/1/3/0/5/130539297/genoz_rosadeluwawope.pdf
    • http://wibier.nl/uploads/1/3/0/4/130492038/5407017.pdf
    • http://kimpietrzak.com/uploads/1/3/0/5/130588798/e3d596ec9e50c.pdf
    • http://wordupcafe.com/uploads/1/3/0/2/130288875/soxaw.pdf
    • http://plumcrazyboutique.shop/uploads/1/3/0/4/130476410/1776809.pdf
    • http://whiteoutfilms.ca/uploads/1/3/0/5/130588833/6997282.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076f6.bin
4bb048e53ce545119b3ef41897830756930c3d0540145fb6b4e517bf24535580		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F6 7584 bytes
font_01_sfnt_off000094b3.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B3 16036 bytes

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