Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6b36f194524515…

MALICIOUS

PDF

60.0 KB Created: 2020-11-12 23:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 58000c7fe837bcc793919d790e2e5576 SHA-1: 17c1d950e913b397da7772ab79def4f23c2e4986 SHA-256: 3a6b36f194524515daba2adac649938cbd24ef3e6a833fd4f4ddd1ab788f29e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 'https://s3.amazonaws.com/divelikubapiwaj/fidet.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's used to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/strik?utm_term=libro+economia+1+bachillerato+edelvi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5f8cca9db2d3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420441/normal_5fa26a1e55a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f88b51a3a519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f8d1506c0f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5f9f7d320c2d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_5f9a97b599c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8a3d323e67a.pdfIn PDF document text
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/fepuli-poxiwitaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_5fad129a5e60b.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/divelikubapiwaj/fidet.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/amphioxus_development.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/biosistematica_definicion.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_off0000ab88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB88 5196 bytes
SHA-256: d635cc8ae03f80fdb727b5ccb28479b6f88a11fa353361f65613df37b36bc54e
font_01_sfnt_off0000bd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0E 11336 bytes
SHA-256: 9a1c8cc9db84667b4b97621c62a873d35fa629903d42297d4081d60ba843215f

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