Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bcfd0ed52559ac…

MALICIOUS

PDF

99.3 KB Created: 2021-02-08 19:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: dffe1b2ebe91c0f9a2e05d957d3f393b SHA-1: ffb6e0a1c00935027077d10018c8ebad7adae895 SHA-256: 31bcfd0ed52559acffe5090e11fc8f7653fee48fbf007fe43c08d74c00f099dc
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified as a phishing attempt by ClamAV and an ML classifier. The document body, though heavily obfuscated, appears to be related to 'Mechanical properties of ceramic materials pdf', likely a lure to entice users to click the malicious link. No scripts were extracted, but the presence of an external URI and the overall detection by multiple engines strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/aws?utm_term=mechanical+properties+of+ceramic+materials+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401985/normal_5fe1eb340f050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_601022d9f3e4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_6008b81370665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5fe07121322d3.pdfIn PDF document text
    • http://idealicaitalia-official.site/marifisd28n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fed7445c09ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff4f02ca54ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_601dd095277fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_6004ece252d54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ff0b751b334a.pdfIn PDF document text
    • http://auto-agents.space/celine_dion_sheet_music_free7rpcn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_6016c1527b6e9.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/mejigavukolu/sales_tax_exemption_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/zinolotomaketojejofaru.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/55601198302.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/lunibizizobepenovebagobaz.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_off0001431e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431E 5400 bytes
SHA-256: fdce6bcd33330fdaffbac3c1860db288593fd223015393c5bf688fd6aa6d6c7a
font_01_sfnt_off0001555d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555D 12820 bytes
SHA-256: f1ae59dc77f00058326cfdebfeff5b03cb83f30894b61270064729dc6a994313

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