Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb597acea1a91954…

MALICIOUS

PDF

72.5 KB Created: 2021-01-03 05:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 225696a9961dc5115c2f732cb4b51a60 SHA-1: 6ffb010e2b2aac461a415e102282c0184ba71651 SHA-256: cb597acea1a91954b5e2a082c2de41a00b38f2e79eb3c3f8020f57810f70bb6e
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://trafftec.ru/aws?utm_term=aaru+movie+songs', which is likely a phishing or malware distribution lure. The document body contains obfuscated text and metadata related to 'wkhtmltopdf', suggesting it was generated programmatically to obscure its malicious intent. No scripts were extracted, but the presence of an external URI strongly indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=aaru+movie+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5faa0608adfac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5f9fdaa1afc15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_5fa3561d8c4d3.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/henghuili-files2/apache_spark_scala_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/88546404265.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/69374931868.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/automated_guided_vehicle_cost_estimation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b8cf5b-482e-47ec-9767-3d8ee8657d72/building_foundations_of_scientific_understanding_volume_2.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/convert_to_dwg_autocad_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a91284-6ba1-476f-bf51-3b8f0c8dbfb1/19007531892.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/commas_in_addresses_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/zikozobo.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/hugo_markdown_syntax_guide.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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 5024 bytes
SHA-256: 8388eb8c08b4f704baa198d167f5307317a30d73162da370574cf580e5fa19ba
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 11132 bytes
SHA-256: c26ae1d05011acb25b08e9575121e092764269c73bd163ce92d9ec63c020bbf3

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