Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c7419004deb00f…

MALICIOUS

PDF

78.5 KB Created: 2020-11-25 17:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 72d3b7506bc03d70b5a34001711e2812 SHA-1: 6c0c71eb901bb2f4817f7a4f02acfcdd80b0c5fb SHA-256: 43c7419004deb00f5ba5496ca2869ea53b687bd82e6dd8ca4107c960660a4433
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, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Chiltons car manuals', suggesting a lure. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/strik?utm_term=chiltons+car+manuals In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f8fb13fac75e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f8bfbf95633f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f9ca26a17e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f929f8b6340b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f873bbf2ef5e.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/nilititonawafim/kufafozadabutod.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/sap_accounting_training.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/city_of_angels_camp_city_hall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb6964a-2f01-4cc2-aea4-a52c62600568/11282575093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c244c1c8-4632-4603-a5bd-65e0c229d571/32038218047.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_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 4944 bytes
SHA-256: 76806042bbeb01d834f0cd10f515552ff269ed651356587fe76f29b61028cd7d
font_01_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 12212 bytes
SHA-256: aad2dce5f8b600ff118905eea6258be8bc5a672c99651a88f10c90fce6a37fb4