Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a8743ae8fbb3b8…

MALICIOUS

PDF

71.0 KB Created: 2021-01-08 15:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 837b359e78895689e0a15fa49368d1df SHA-1: d805a105a2bd993063ce4691962116f3631bee22 SHA-256: 57a8743ae8fbb3b8b783024f674b21954c5699bae6f28e08eaf5261c8f62a0e4
154 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains an embedded URL that redirects to a suspicious domain, likely for phishing or malware distribution. The PDF structure and embedded content suggest it's designed to lure users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffine.ru/aws?utm_term=phd+thesis+defense+powerpoint+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5fdc67e27cef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fd7f7f31c052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fe7a367c6ce6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5ff16769790ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fae14cbb4579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd31548af172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5febe5c44d7ba.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/ggJUDqb/flag_football_championship_rings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f9c92d5c8e9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383314/normal_5fca5d3fa8011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495254/normal_5feb4c6770b82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fc7e1076249c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5f9d0b2d5d22d.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/solonebosop/vernier_caliper_accuracy.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/zepabinodosunogas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406e57c1-b683-492a-a431-43a514ec6341/fawilonuwijurivitudaxe.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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 5376 bytes
SHA-256: b1233339866c9388d6d748592ca76ccbc194d80efabb93d1c82d5c5333fc6314
font_01_sfnt_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 10548 bytes
SHA-256: af7864afeb979901747e69d4d850cc592de4b45b4866e012e24cbf6f51698e96

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