Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b31be7fba379660…

MALICIOUS

PDF

32.5 KB Created: 2020-04-11 12:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 60fee4ddaa24b12e784de4d96637e55b SHA-1: d54aad9fc2f9125923829134e50f7b6bcfd1ce8e SHA-256: 8b31be7fba379660ede3813b678afbc85a2231ef03784e92637357126937c5d3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The document body also contains some of these URLs, reinforcing the link farm attack pattern. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://whiteowlcolorstudio.com/uploads/1/3/0/5/130541221/130541221.html#flames+of+the+faithful PDF link annotation
    • http://sclassified.net/uploads/1/3/0/9/130969062/4929079.pdfIn PDF document text
    • http://starmapseries.com/uploads/1/3/1/4/131437017/nesaninen.pdfIn PDF document text
    • http://beyondhillco.com/uploads/1/3/1/0/131070220/1427995.pdfIn PDF document text
    • http://edgrowthgroup.net/uploads/1/3/0/2/130272362/6267820.pdfIn PDF document text
    • http://ww.royalanimalhealthuniversity.com/uploads/1/3/0/2/130289554/lomebumiguxex.pdfIn PDF document text
    • http://zoelifeprayercoachingcenter.com/uploads/1/3/1/1/131163533/fodulaluvalera.pdfIn PDF document text
    • http://hostmaster.ferienhaus-insel-texel.com/uploads/1/3/0/5/130588258/kofezukezajon.pdfIn PDF document text
    • http://torayajaigarvinfoundation.net/uploads/1/3/0/2/130289524/romudizemefexuxe.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

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_off0000587b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x587B 7756 bytes
SHA-256: 4a6299faebcd61b45bc4ffb29fca18fdccc5fc1967d12936c5690f67e25e78b1

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