Malicious PDF — malware analysis report

Static analysis result for SHA-256 337e73cd4b51108c…

MALICIOUS

PDF

75.9 KB Created: 2021-02-17 05:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e09d8aa2e4ded51a19909cb247b378d2 SHA-1: b5a343a54d19d2a3d3b90ed8b7bf5cf277a7673f SHA-256: 337e73cd4b51108cab112a43e99c77019c37ea3a20ef578070ee047833397542
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to a suspicious domain, which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'proof david auburn quotes'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

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://leonvi.ru/123?utm_term=proof+david+auburn+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424981/normal_601f088d0e4db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369802/normal_60004433373ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5fd7a9a62f2f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5fd095ddb53d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418567/normal_5fde142cdd055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_600f9beb8299a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383792/normal_5ff9f56935461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391602/normal_5ff7de272c3a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe24cca7ddf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_60179c361d606.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/wexoteluwag/33659849983.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/business_information_management_teks.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/girlfriends_guide_to_divorce_finale_season_5.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/januviterogiru.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/photography_blog_templates.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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 5196 bytes
SHA-256: 34bd0176061bd746d403fee7dfbf52f6d73b8dc8a9a4301c2175b2ad88bfdcd2
font_01_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 10564 bytes
SHA-256: 99800e08da8bdc2e53a0a701402e366fe56f5e3ccb4f15ed650aebfe8bb5f1c5

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