Malicious PDF — malware analysis report

Static analysis result for SHA-256 9454df64e7be8724…

MALICIOUS

PDF

81.6 KB Created: 2021-03-08 14:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 964c915bf148a79fb98c00096d976e5b SHA-1: 912d44aed835b32983712a3a8d20279bac6e2a18 SHA-256: 9454df64e7be87243020330365e6e3c04f1a4945c11952c1aa4347bbcdfd983b
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=logical+fallacies+quiz+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382613/normal_6032f7807a89b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fcccc7f58edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_6044957562bfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389805/normal_5ff0cf32a499a.pdfIn PDF document text
    • https://dewifekezag.weebly.com/uploads/1/3/5/3/135313931/libefavidawulok.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/xubumemazovatekenus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_6033d4fe167a0.pdfIn PDF document text
    • http://nomozufigupet.iblogger.org/curso_de_primeros_auxilios_cruz_roja_gratis_costa_rica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bewaxupu.rf.gd/2940133722.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/nasumubatugibusajurapi.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/modernist_cuisine_at_home_espaol_gratis.pdfIn PDF document text
    • https://db2cba7c-d19d-4716-84d1-34a39f54132a.filesusr.com/ugd/10b03a_e358fa74e695489a9e536103f3257636.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_0531c6bd25944a7f95426a32daa4f028.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/61757517060.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_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 5624 bytes
SHA-256: 31792fd2ab4a509594b6490ba1a921df084e0ffa2d3d9dd8e8b9f2190dd92486
font_01_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 10456 bytes
SHA-256: 9db548b43670a92ca6c5ee89bdf07637994a63edefa6d01b1cf001686e186dbd

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