Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4f281a7bc3b715…

MALICIOUS

PDF

95.5 KB Created: 2021-01-06 02:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 90b3df25a13c23207803d906719c0175 SHA-1: 652ed0e317a94d17a3be4f5465edf67cccbbc75f SHA-256: 7f4f281a7bc3b715e883f998096a8b0b5adbb469f5803bcc6fa2574e05342703
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafftec.ru/aws', which is likely a phishing lure disguised as a job class guide. The presence of embedded URLs and the nature of the ClamAV detection suggest an attempt to redirect users to a malicious site for credential harvesting or further malware delivery.

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://trafftec.ru/aws?utm_term=laplace+m+job+class+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5fccdff69d843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fe1c0a3796ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5f9f9839403f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd5ff97bc79b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5f9c9c2c954d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5fd88b30906ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452385/normal_5fc4a45c9aa24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5fdd7e922f3f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/tazinimifibuxawak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8111d911-ab75-4856-87fa-a5ed55d680ca/xuwupefuxezubeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682d12d4-40ae-488e-9bc4-59c8b1de47c9/66774015590.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/21243066434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05525c2-ac22-4ac7-a7bc-f6006a13acf0/ruvabukorupuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90b3947-1ab1-4909-b399-0efa305208e4/fruit_dash_mod_apk_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6c50a9-10b0-45d0-a70f-7964fd593ca5/john_ratcliffe_pocahontas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdbdcd7-93f9-4ba4-ad78-17827f1475d9/rally_racer_dirt_v1._5._5_mod_apk.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_off0001384f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 5456 bytes
SHA-256: bee3a8efb1977b4f83e282d0e285a74ef518a23ba24dfabe34f5c4c5da6ecb36
font_01_sfnt_off00014ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC5 11104 bytes
SHA-256: 9ef7b93286be9361be80c3d0c4277bab9f0470fbb2624f09a3c4859e35b70c65

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