Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1279dc6fa88b10…

MALICIOUS

PDF

77.2 KB Created: 2021-02-10 15:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4255990b78a676801fb7d24ce1b69aea SHA-1: e6003d205da7ed6e7c4523ad338bef447b586d58 SHA-256: ca1279dc6fa88b107510856087369616df94696e838d0d9e986dea99742ac136
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that directs to a malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The PDF's content, though heavily obfuscated, appears to be a lure for reported speech rules, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wb?keyword=reported%20speech%20rules%20and%20their%20usage PDF link annotation
    • https://cdn.sqhk.co/soxuvezosapa/alifmAl/pregnancy_tracker_week_by_week.pdfIn PDF document text
    • https://cdn.sqhk.co/varaxupumami/elMl1jf/didowediwupoke.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/6jggiib/microsoft_365_sharepoint_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5fc878be7f46e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_6018ac98aba9c.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/jL0gdDU/6411192808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5ff5315d17f73.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/d7jaxji/sub_meter_reading_calculator.pdfIn PDF document text
    • http://kokilubowo.22web.org/4622656092.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/dL8mGii/stress_management_techniques_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/LCTUFge/95723695092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jivamubug/2016_movies_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/amazon_sheets_twin.pdfIn PDF document text
    • http://norisufa.epizy.com/wijudatagil.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/lilatozopezoset.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/diablo_3_necromancer_leveling_guide_1-_70.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/potobakixev.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/asrs_report_autism.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/jiwubej.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/tinunavefogalosisive.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/98225173716.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 5224 bytes
SHA-256: 4b7e27034fa0fa0ca630133f5f1465163e7fdf0c876534334c102374b2efeb17
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10640 bytes
SHA-256: e84bbc0f1a4562b99aeaef79a1510fc859880905148937d42c081e8143863a47
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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