Malicious PDF — malware analysis report

Static analysis result for SHA-256 58acf3dd831cd10c…

MALICIOUS

PDF

58.8 KB Created: 2020-11-10 19:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c2dce90e0833575e60415fd2b8d3bba SHA-1: 5850a8387f7d33f76dd689c4c86e5c795be509a0 SHA-256: 58acf3dd831cd10c4d7286e603e13489484a91176198e76fe40383517ec9fe23
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gettraff.ru/aws?keyword=map+of+johnson+lake+nebraska In PDF document text
    • https://zuxubemusaf.weebly.com/uploads/1/3/1/4/131453996/nirup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_5fa7d3b92d1e6.pdfIn PDF document text
    • https://guxeximufi.weebly.com/uploads/1/3/4/2/134235584/9980740.pdfIn PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/7727690.pdfIn PDF document text
    • https://lowisaxov.weebly.com/uploads/1/3/4/3/134361609/6107002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f90ae9cd2382.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/9c06d270-582c-4f5a-ae79-592b58830419/pogamotiki.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/administration_and_management_in_physical_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029e76be-80dd-45a3-947c-ef5f1eaa7123/sijudisamagofewepag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb04baa8-c75a-49a6-9a10-6b99b5c67ccd/kefoduligenine.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_off0000aa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7A 5276 bytes
SHA-256: 767d5bd58d3d4608007c84c2f3ae014ba39e90f3c57ee0ff056a301c27d51bdb
font_01_sfnt_off0000bc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC72 10140 bytes
SHA-256: 78bffdc78378c0aef31ec6073a489da9c7c0daf3ed6fa1e56c869ede12f83137