Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4ff3dec50022b0…

MALICIOUS

PDF

78.8 KB Created: 2021-02-15 19:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: fc23cb903df137f0802a849cee8da382 SHA-1: 5bed36412a1638e6b58dacc7af81a9494923d07b SHA-256: fa4ff3dec50022b04814a12f63113e526c5458aac8a05f2523a0c9ac5552a731
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/wix?keyword=wangenheim+middle+school+san+diego+ca PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5ffff6daa0aee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481539/normal_5ff26aa35906d.pdfIn PDF document text
    • https://bivibubumi.weebly.com/uploads/1/3/1/6/131637176/5f67680.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/ggWjgas/4076557878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_6013bc6e75e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_602644cf4a326.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/Cqijfjc/malwarebytes_security_virus_cleaner_anti-_malware.pdfIn PDF document text
    • http://gexafozo.22web.org/54549873414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_601b636d900ab.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/zexukiva.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/3hiC40Z/angry_birds_match_3._2._1_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/543Tgj4/muxin.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/zolerazowubow/wanopuwozakuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/senior_sales_manager_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/employment_history_resume_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/73773442152.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_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 5272 bytes
SHA-256: ef1d0f8115191c54d9d6eb1072d2e9f0d0a553f9b50b3822c0bf81d281d17158
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 10616 bytes
SHA-256: 1ee2713e3034366c767896e08c7f84a9c913946b216b1b50bf7d5485156ed209

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