Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d73fd10978c0dc…

MALICIOUS

PDF

39.7 KB Created: 2020-04-07 14:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3369a3be65af3f227671b64a2af4af69 SHA-1: ce0fd49b607f313d9ed2f2ed6cde8a419cd2a8e5 SHA-256: e4d73fd10978c0dcf7b97c24ee1a147d7e230f68f879ea076c352ae8c0f0979b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious. The document body, though partially obfuscated, contains references to these external URLs, suggesting a link farm or distribution mechanism for further malicious content. No scripts were extracted from this sample.

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://tanzattiffanyz.com/uploads/1/3/0/5/130588654/130588654.html#english+test+level+11
    • http://lyterion.com/uploads/1/3/0/2/130288562/jerediz_gamijetekepuku.pdf
    • http://beveren.ie/uploads/1/3/0/6/130622009/mapoxalo.pdf
    • http://elsejobs.net/uploads/1/3/0/3/130379342/nogudes_desij.pdf
    • http://lovelepink.com/uploads/1/3/0/4/130489081/1388573.pdf
    • http://betterl.com/uploads/1/3/1/3/131379443/mizuwe_lotizinujo_pesedofukojezo.pdf
    • http://artisinmarketdetroit.com/uploads/1/3/0/2/130289458/kafemajok_vovatunujuxo.pdf
    • http://gavinandstaceygifts.com/uploads/1/3/1/1/131163751/121955.pdf
    • http://marvinlegalteam.com/uploads/1/3/0/6/130639081/0ee88d.pdf
    • http://dbprlawyer.com/uploads/1/3/0/8/130813364/7480405.pdf
    • http://ikarosav.com/uploads/1/3/0/7/130738911/fumulemuvedure.pdf
    • http://concretetesting.org/uploads/1/3/0/2/130287283/e800b.pdf
    • http://tek4yourlife.com/uploads/1/3/1/4/131452826/52c80.pdf
    • http://sundaracharterstrinidad.com/uploads/1/3/0/2/130272903/1a6a9095a.pdf
    • http://shaneantisdel.com/uploads/1/3/0/9/130968947/89d47d0d9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c81.bin
1286f360d44b688d18b7a67f2be7d0da8589a21ad4cf39a4f118d78669b5522f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 8064 bytes
font_01_sfnt_off00007bd4.bin
f304d5248de4d2d535e11e5a3f00133999c598ccb7ee943f2677ab784214679d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 16208 bytes

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