Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92dbb7e0a3948ea…

MALICIOUS

PDF

68.6 KB Created: 2020-12-24 02:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b648d192b7543aa7d12b8fe1761e7c37 SHA-1: d5ab117ba86032c3692946da97747e8c81e0aa1b SHA-256: f92dbb7e0a3948ea1d88fb4c8163a750d0871192a7f17277be1f72d581651db9
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm or phishing attempt, potentially leading to further malicious content or exploitation.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/strik?utm_term=escape+room+game+paradise In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_5fd5f048f046f.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/Mjchnmm/occupational_health_center_pascagoula_ms.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/febekoti.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/9aa71.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/zedobe.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/fadedosi/wefuxizajo.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/creative_brief_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/timabuwofa.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/77941408438.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/box_method_division_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/demukonipilubekedurad.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/marulepoxirisi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF8 4760 bytes
SHA-256: 14590aa1db7a87bc767a36a4952cddbdcc7a2fbbdb4cef1f4bc2511f9a2fc6f2
font_01_sfnt_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 5320 bytes
SHA-256: ae001da700a981b57346d2e14a71868ee381d1a74160fa7b691a0695b9b7566b
font_02_sfnt_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 10800 bytes
SHA-256: 7303f45ccfad4639712a6cb5111570f3269725c4978c454838bb8a659c07a2fd

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