Malicious PDF — malware analysis report

Static analysis result for SHA-256 d582418e221ab41a…

MALICIOUS

PDF

83.1 KB Created: 2021-05-29 07:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 896c7c4f421da88695feaba80d83b94f SHA-1: ce2eda31fa6a95eeeb6ff14b7e965ee49bcaac84 SHA-256: d582418e221ab41a4488486da7808c6aecd9d1e2293b29fdb6ddb716dfae54d6
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 as a link farm, pointing to other PDF documents. One of these links, https://lozipotod.ru/strik?utm_term=imagenes+modelo+atomico+de+schrodinger, is likely the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution via these linked resources.

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 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://lozipotod.ru/strik?utm_term=imagenes+modelo+atomico+de+schrodinger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408709/normal_5fda2ea292322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_600a99c8c78b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_6016216d52d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_602b89e78bd64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_6064938422e2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418791/normal_5ffd2cbcb9954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fd2d2d04b27e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_6030684b93744.pdfIn PDF document text
    • https://narufana.weebly.com/uploads/1/3/4/6/134653256/rokazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369632/normal_5fee4508c4ef0.pdfIn PDF document text
    • https://gozowejikagigu.weebly.com/uploads/1/3/5/3/135345496/31a6727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_602be63f69c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452618/normal_602eadbc2d8a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5fdca32702444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_602936ffb6c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_601e79a661e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60273af6ed70d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4420612/normal_60b1427dd1882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc421446-7632-45ef-80ac-dbd01ac7246b/39254808869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552d336d-8ddc-4c9f-92df-ceb0c0f552e3/4974886257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cecedfb-af6a-4e81-8515-726b67083327/juegos_para_baby_shower_para_imprimir_con_respuestas.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_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 5288 bytes
SHA-256: 4db074d064887c45cfe0735159f11eeb592d9f45d5f0e72a9b0f58889d5bac61
font_01_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 13188 bytes
SHA-256: ba750003f6388996ade04d060cd71d86c17f63128fd3051e3506e05d174fa446

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