Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a4a0e3b1abb89f…

MALICIOUS

PDF

61.9 KB Created: 2020-11-26 08:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3b1de0d07e92e27f69df938b62b44899 SHA-1: d6bbca874e1181cb63ee0ef8d7620475d1406d65 SHA-256: 36a4a0e3b1abb89f5c832cdfe92ac49ba9112d5335d4592a65a4281bc9632fa0
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search results or distribute content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=hand+boiler+science+toy In PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/sodefibowuz-zigemunu-mamafogijol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f9303140a50c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_5fb8b02bca992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_5fa4941255df1.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/b156bfb1-494a-4152-a87f-dd15709ed508/how_to_take_apart_a_motorguide_troll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f348f4a-60b9-4919-a0e2-cf1b828f2451/67570185155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc8b7da-25ac-4e9f-9011-387680681d9f/33984538998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4cf778-8ddd-4628-be94-bedce7ddbf72/crafting_guide_ffxiv_heavensward.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23a739d-edaf-4047-a5cd-346f1af30bd5/81086286664.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/como_hackear_whatsapp_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c84883-d9e6-4f5f-97ce-e409fb41c29c/makeup_artist_resume_template_free.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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 5136 bytes
SHA-256: 017559f7636c665bf81cbccc5a2d0310b8a0ef42b45a5318a84d4840d3e615ee
font_01_sfnt_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 10388 bytes
SHA-256: 0abba94e341836f23112850e28aa0f844be56f9db45ffae6bcf5668c5f8e9a9c

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