Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21bb5df5b553445…

MALICIOUS

PDF

80.1 KB Created: 2020-12-21 03:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3f55de93ae76b6694803a18539da47b8 SHA-1: 7395940b259e12877f6eebf2cc76cd0998d1d709 SHA-256: b21bb5df5b553445dba42bc4d9fb05597d920b1e602b2aae636cbda2c7432c5a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?utm_term=ouroboros+definition+pronunciation'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://traffmen.ru/strik?utm_term=ouroboros+definition+pronunciation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f97ae1e826af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f9e445189a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f8a907b81912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_5fd7c67373e95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8ee7bff3f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_5fc0afd2e53ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5fb2b9b8ae38a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8723a08902e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd2420e7a2a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_5fa5f70a7adbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wixatax/nivozoxoxatinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62ca0ec-afc1-48f1-9e7f-e68bce821e37/suzumubijagudatuziw.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/40935447471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2df54e-94e8-463c-9006-994ad3c845a3/91758719541.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/severe_anemia.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/ios_icon_template_illustrator.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 5164 bytes
SHA-256: 370a679d833a08839b4ea67133e06d0ef85a74baf7fc33caea2fc5a86f8398c6
font_01_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 14464 bytes
SHA-256: f0428cc6cff8852ad6bb4f025fa80de8555caeda9dd32317916db0c718e5e097
font_02_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 16180 bytes
SHA-256: 5a02aa09471a1fa0ab2aec2890e5d13084d7dc3c07ac7d1dd32d07a96d558847
font_03_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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