Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b050028d86bfb68…

MALICIOUS

PDF

72.6 KB Created: 2021-03-18 00:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8996f99992dae9b667129dd2a3f2497 SHA-1: d3f4cb7970c26bacf91f5d25f86c8433b4e66e14 SHA-256: 8b050028d86bfb68e9b38c227ea2e6c5e284576bcd3e4e783c22312295629878
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=manuel+agronomie+tropicale+pdf
    • https://cdn-cms.f-static.net/uploads/4383471/normal_60527f84029a3.pdf
    • https://cdn-cms.f-static.net/uploads/4450240/normal_601f81d3d5e0e.pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6045de0be7588.pdf
    • https://cdn-cms.f-static.net/uploads/4374537/normal_604747f0bfa71.pdf
    • https://cdn-cms.f-static.net/uploads/4479904/normal_6010a0d82a556.pdf
    • https://cdn-cms.f-static.net/uploads/4475194/normal_6019d152c08f4.pdf
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5fe46568307e7.pdf
    • https://cdn-cms.f-static.net/uploads/4459645/normal_602ce94ab0d7f.pdf
    • https://static.s123-cdn-static.com/uploads/4393356/normal_6005c20b24b19.pdf
    • https://cdn-cms.f-static.net/uploads/4490129/normal_600aefcdd8afb.pdf
    • https://cdn-cms.f-static.net/uploads/4459058/normal_603f4e8660d93.pdf
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fe3e6a5717bf.pdf
    • http://gizovivomiz.getenjoyment.net/javascript_tutorial_complete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_6b787ec892c34a66abb694eb4f3560c4.pdf?index=true
    • http://mifinuxob.epizy.com/what_are_the_physics_equations.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_7cf3d9092ea441d28dc78cd0aa0d0f01.pdf?index=true
    • http://josuxak.atwebpages.com/35543502470.pdf
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_8f71ff7c6c86463aae1e69e7fc5d6f5e.pdf?index=true
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_19e7a768a9eb4d91b075ff57bece91b7.pdf?index=true
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_b01dd62ca66e42c2b1823da39b57811a.pdf?index=true
    • http://merekum.rf.gd/56755395865.pdf
    • http://wififeju.atwebpages.com/28717587647.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7e.bin
91ea142d6d38804960aa8db5b2656b85d25c1abf2e851b4b85a5adabe1d2ab6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 5300 bytes
font_01_sfnt_off0000ef80.bin
0cbaa2097249993f4432688f16b48dd7a1a6547d32b392a8149ba311b442ad75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 10844 bytes

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