Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef708ccaa1b28c95…

MALICIOUS

PDF

62.8 KB Created: 2020-12-16 19:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f166d2fecfd3c39ec08055f9cea99522 SHA-1: 31d598c9b141ec38a694c89b7d4ba268c4209dea SHA-256: ef708ccaa1b28c95356d6fc761357fb25a83f79434b5b3865e7df01c69abe12f
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, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely part of the phishing lure. The document body, though heavily obfuscated, suggests a context of educational material, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trafficel.ru/123?utm_term=graphing+secant+and+cosecant+functions+practice+worksheet+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce96b7a64064676dec2ab7/t/5fd134154e12041f6817bf7f/1607545877949/69211072500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6781857-2ea6-4c20-8014-d7617a81e469/pathfinder_curse_of_the_crimson_throne.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/56354881516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055e4dff-420b-42ad-ab8b-7a538663b250/lufarovinaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/78008031132.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/zejutuxav.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/cdf_file_format_mass_spectrometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fefde9e-d26e-4d4d-b9b2-e57f9e89f8ce/91594227092.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/android_emulator_app_cannot_access_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/canticle_of_zechariah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4105d450-fc3f-4329-a698-7c7f6c3ebca6/85714257029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15e2e7c-6b40-415e-955e-205193444f78/fafoxugozom.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/center_worksheet_horizontally_and_vertically_excel.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_off0000b6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 5572 bytes
SHA-256: e787dd33fe507f2208c02239929985e0031e0663277f052e19dedac5f68080f5
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 10568 bytes
SHA-256: 4e9267e8089e690d98556beeb906a0d44ece7e7ec1da6c6eaca352d12fa0870f