Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5bafb35d798658…

MALICIOUS

PDF

65.9 KB Created: 2020-11-18 01:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d32b97835b728bd7e3c3687e83b6ddce SHA-1: e00a859010c27aee7da0a4334d04a4d691c752db SHA-256: 6c5bafb35d7986589f3480eba8fc833783f099e53ab7874768faac1f379ca883
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, potentially part of a lure. No scripts were extracted, but the presence of external URIs and the malicious verdict strongly indicate a malicious intent.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=uf+calendar+2019+to+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5fa5a8a528c2d.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/gosifigodasawi-dizowuxu-dazorodeviv-bulapivuzuwile.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/8039107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5f9ffe2e61e1f.pdfIn PDF document text
    • https://sipavokipepino.weebly.com/uploads/1/3/4/3/134330850/45c099354cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5fa97791d37e0.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/4407878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8e5f9f77e6c.pdfIn PDF document text
    • https://runevivapubate.weebly.com/uploads/1/3/4/5/134595370/defuxe.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/78afc9b1-b6c5-48bf-8c1b-755161f1fd90/xaposedinulipiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0427ac42-8a6c-48a6-8091-68111c359463/gijilosutezesefenuzalebit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4ce9b2-025a-4b28-9036-4228b0ed03c8/91403149113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8df325a-f471-4c2f-ba0c-01bb8ae8f89d/77174408466.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_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 5312 bytes
SHA-256: bdc6f5e491797da60b40267d3ea28c4ff9e844b745eab65892ce72fd7b3a3dcf
font_01_sfnt_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10480 bytes
SHA-256: 7aa452d1863a88ababd9c2a1ba56c2859174948bd5e28091b60e6665da54a1e4