Malicious PDF — malware analysis report

Static analysis result for SHA-256 55557925bb9cec38…

MALICIOUS

PDF

80.3 KB Created: 2020-11-10 17:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3ebbdd8f5d8451b5c120a390a7af282d SHA-1: 100b538313cedc3bc9b88296807406b8a861e63f SHA-256: 55557925bb9cec38511a9a78d5a00386ed871c9a9b0babe50bab92e3840965ea
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafficel.ru/strik?keyword=watch+venom+2018+online+full+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5f98f65fa3a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fa719af88e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f9460743e39e.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/3106b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f8b80ad8e392.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/suzemumawetup_tolufitites_rupoxobuga_figero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5f9661e516cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5f99f3e2cc3e8.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/sizadagazagaj/assignment_of_benefits_form_homeowners_insurance.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/movie2k_online_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166441e0-14bd-4faa-88f5-e06566c9cb5a/32546233509.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/89572838035.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_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 5440 bytes
SHA-256: bcae749d2402fb229f270400611dcbe42bc56b3b4d426dee224a6bea535ee8d0
font_01_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 10448 bytes
SHA-256: 29b7b8a12993db336bac298c8b870d44f1a6b8bc9fd2e3cc6dd2590cb631a065