Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4f6437b066586e…

MALICIOUS

PDF

63.3 KB Created: 2020-12-24 02:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 31a259045f31669d6ff3f266758c34a3 SHA-1: 16a09cc15da9380273687fc0d3840f28cb50e7b7 SHA-256: 4f4f6437b066586ea61aebf9a05b5ee595325248fcee7f2b64c064848ad126ef
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains text related to 'Animal Crossing' and 'fish guide', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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=animal+crossing+new+leaf+fish+guide+april PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f90123a82735.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/ShhM6O6/36940042455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5fc11f72847f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f8b6206bb045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_5fd9e83fe1905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500878/normal_5fc50f695c1ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fa23dc950138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fd8a95d5a6a7.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/1902e161-ca44-42a1-81ef-a34b3f9cc2d3/30342413608.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_off0000bb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB16 5652 bytes
SHA-256: 5e7be9308b79da3337556f8cfbc085ab86c347032e9686463ca78550bf87e766
font_01_sfnt_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 10080 bytes
SHA-256: 1a0a1959f363e328e6fbad357b02b5a070a502a91b08b60e884724ae9c93b627

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