Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d3d7f0b48537fa…

MALICIOUS

PDF

68.3 KB Created: 2020-11-19 21:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6a2094e8c9a861286656206ad31a3736 SHA-1: b834439f7e989e4935ba1974d597b65daaa87065 SHA-256: a8d3d7f0b48537fa5e59015d135af7179a5520daca531bdd1914088494743be7
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of the external URI suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=motor+control+frame+of+reference PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5fa1b76a32bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5fa8f8934032b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459630/normal_5fa321fa01de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fb00b2095a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f90cd9880c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5fabf38a2e2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fb5bf833f82b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_5f95daf896105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5f8fe13be4859.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/xakusineba/tioga_high_school_la.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/piscine_axe_majeur_espace_remise_en_forme.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/bupirilap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce8ef7a-e3b5-4ddd-8e11-69143c3235f3/wunuj.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_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 4856 bytes
SHA-256: ebfc12a5cbab7c6d2aaf3f21336a684a746d6a183898ec36c67213b3a0809626
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 10852 bytes
SHA-256: bbf0ae0c08d8781adf7972078e1adf52c827ce5510f14abe79d592b21bfcec40