Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b00db6209c3a253…

MALICIOUS

PDF

95.6 KB Created: 2020-11-19 02:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ef7a24f04622e7d12a28984999a3aa45 SHA-1: d9d76db16847b29f41981f1acb48e5329b26c6fb SHA-256: 1b00db6209c3a253a763ec025c9a5e463ccb784a57772f040155b0e08ae5127b
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to other PDFs, forming a link farm. One of these links, https://cctraff.ru/strik?utm_term=rainwear+central+viewforum, is identified as a known malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=rainwear+central+viewforum In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5fb39c81c2d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8c0d4890d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5f967c57a3d47.pdfIn PDF document text
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/a69976de5f.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/5071330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_5fa9fd65b7dcf.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/levovod/information_about_love_birds_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/saziteviwenebabolakeduzi.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/john_phillips_bible_commentary_online.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_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 4180 bytes
SHA-256: 0139d260d73598b75f58ea468e1ed661a90c6fa765c59ce0bb0613d73df3714c
font_01_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 5008 bytes
SHA-256: 5ae396e84509588c7edb78872a363d84879db55cd86ba569aa90da9de240a866
font_02_sfnt_off000148fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FD 11856 bytes
SHA-256: 688019db8ed2236971044230ee7d3421d7be3285f0e858d49c3736c3b4c7a378

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