Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebd116a6003f3af…

MALICIOUS

PDF

127.6 KB Created: 2021-03-19 04:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff656b6fdef9b3502ae0a57eaea497c0 SHA-1: b686f14eac38924c6f19fdb3c5d5ead52043fee8 SHA-256: 4ebd116a6003f3afa964c8708fc26d806abeb57dc3b137d3a2ff616d20a882ee
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 are dynamically generated, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://ponafet.ru/123?utm_term=dvd+charlie+brown+jr+skate+vibration, which is likely used to redirect the user to a malicious site. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=dvd+charlie+brown+jr+skate+vibration
    • https://cdn-cms.f-static.net/uploads/4369525/normal_602231c2e93c2.pdf
    • https://cdn-cms.f-static.net/uploads/4418981/normal_601b373be9a20.pdf
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ff2d8e610a35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_4f1e5f938d08470799f542ac619e3289.pdf?index=true
    • http://nanesipub.rf.gd/43667446340.pdf
    • https://s3.amazonaws.com/zuwimadaneb/after_school_care_application_form.pdf
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_944ae3e5aa9f4e188c020d4aeae72bf9.pdf?index=true
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_a2b22a3d6fbf4525a895e41e4a151ea2.pdf?index=true
    • https://s3.amazonaws.com/datarofapakil/gitufovotika.pdf
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_a6d9c566d759488d8d3868f0c694446f.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_703248e031af4695b0b354f5ec1da1cf.pdf?index=true
    • https://s3.amazonaws.com/xamibebulosaxug/genestealer_cult_codex_7th_edition.pdf
    • http://losotejusegiso.rf.gd/brehon_law.pdf
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_bf940709f95d40ff87f32104b2d191f7.pdf?index=true
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_4916f378a30a41d1b7930e15ac3b3e79.pdf?index=true
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_b2e8dd7115364330bacc047ceca3c2b1.pdf?index=true
    • http://fokibuzevurir.rf.gd/kikagatakizosovuka.pdf
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_9a14f6ec25fe40f8ad05eaed73af3c9d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc39.bin
12cb839f0f425dd9a4ca4ec40cb3875261863690b596edfd8a4502ebeb19192e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 72368 bytes
font_01_sfnt_off0001b7b0.bin
00678621b23745e3557388c311d5cd026f85499809acf410a42c25debc628118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7B0 5460 bytes
font_02_sfnt_off0001ca54.bin
e43b0b7f31ce9e56128b1122db639c4b9aed31b79b5c92c49a6793915fa2eded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA54 10452 bytes

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