Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3acd689d765df2f…

MALICIOUS

PDF

77.7 KB Created: 2021-05-28 13:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fe5e5a5a5ff6fc74a9431701aae55f75 SHA-1: e708bbee77b0ce4952e7bc9ed61eebeae769a68e SHA-256: a3acd689d765df2f1a8bbc3662c757eb8768ef097bdd2d2c7f544710d9899686
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'barrier island formation animation'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/123?utm_term=barrier+island+formation+animation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413000/normal_6048f1c7d0dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_603c1faa6a10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_6063d677299e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_602a420e202c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_5fe93b622d6d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412164/normal_5ff02afc0dbbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5fee742517b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_600d241f36d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_600f32ee2e1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_6049d5d8bf873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_602ef23a7f41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_60225a440899d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_602aee1f6cd2a.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/7cb121c4-1aed-43b6-a19f-9dc2103eb501/74459632408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f8e4b1-60f8-478d-bde7-5c2b840fa03f/11964626137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb7797e-08d7-4d72-a269-d408af34c22e/xiwowelotakadogower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9ddb34-0e34-414a-8b29-2ba7068ced2a/how_to_use_solution_focused_brief_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fd74a0-459d-4dd6-9719-3e0f08976c0f/97618814474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ff437d-9fad-4817-af1a-9f18e0b0f86c/hp_pavilion_27-r114_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5100 bytes
SHA-256: c43d670e9691ca7eaf7374b95dda7519616cdd0490cf9eec9138da173baa8480
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 12116 bytes
SHA-256: 77e51b07a85065b1ea800b31f1c2a6261359d3da81257c1b0d2d3232418b773f

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