Malicious PDF — malware analysis report

Static analysis result for SHA-256 edce3f09ef5f6164…

MALICIOUS

PDF

35.2 KB Created: 2020-11-06 04:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b796de949b5a9f52a288518a48008a54 SHA-1: c182ef84ebac5e64b4b1836676acfa131f1e8f3a SHA-256: edce3f09ef5f61645617750195181d6b85f01c3ba28044aa2c88e9c186248a1f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified as a link farm, with the primary suspicious URL being 'https://trafffi.ru/123?keyword=cyriopagopus+sp.+sumatran+tiger'. The ML classifier also flagged this PDF as malicious with high confidence. The embedded links suggest an attempt to direct users to potentially malicious or SEO-manipulated content, which is a common tactic for distributing malware or phishing pages.

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 https://trafffi.ru/123?keyword=cyriopagopus+sp.+sumatran+tiger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449629/normal_5fa26f01a6c78.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/magetigowewifi-basinaxipite.pdfIn PDF document text
    • https://xufizigox.weebly.com/uploads/1/3/4/4/134479456/wegovaxes-panimo-jikipu-mabakaxivifowil.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/sexadeximubapim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8cce34d6b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f8dfb3773a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_5f91642735976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f8f004beeff0.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/9429723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f9a60553138d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8800b871c0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9fa83c-c5d3-4c2e-bd07-1a9a9969faa4/43597649392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44394aa8-ad3e-41ef-b1cb-15f5ca8b4346/begivuver.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4357 5144 bytes
SHA-256: 5011a369225a7b5d3cf6750c7a9b4c0b757fbf6927d5dfd242677546827f3e7d
font_01_sfnt_off000054ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54CE 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00006031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6031 9192 bytes
SHA-256: d81d8ec66d9121198f4c46bbd88b1e30fba74bb101cf3776453de62ea1afd79d

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