Malicious PDF — malware analysis report

Static analysis result for SHA-256 278e877e2fa81715…

MALICIOUS

PDF

77.7 KB Created: 2021-02-26 08:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 16d4ace40e91edfb57c6bfa1bf372472 SHA-1: c2d92da3247bad2592fb0bff8f29e65ad7290ed6 SHA-256: 278e877e2fa8171570e2963317f52b26f3a2c34a9f6e641750d1b24c6d654c0f
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, with a specific detection name indicating it's a phishing trojan. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics indicate the presence of malicious content designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=linux+all-in-one+desk+reference+for+dummies+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417525/normal_600ac67f8eebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_600a0fa429d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_600d5029973c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492536/normal_5fcaf3f75de2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5feb96c067993.pdfIn PDF document text
    • http://kunabote.22web.org/can_a_clogged_water_filter_cause_a_refrigerator_to_leak.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/pghOhcw/jobeverenax.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/gKeoTid/best_cheap_laptops_for_students_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5ff4c5145633d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5ffc038232c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_602f00487301c.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/jupudizadid/rujadaluvogaxofoni.pdfIn PDF document text
    • http://sosubixoza.rf.gd/31428886255.pdfIn PDF document text
    • http://zigexejumex.epizy.com/36395459720.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/gloomhaven_scoundrel_character_sheet.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_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 5408 bytes
SHA-256: 5c85d2ccb0d00f530ef91d6ef072edc52dd62536a04927d22ef593684e6fd39c
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10640 bytes
SHA-256: 80c743fbf076a445194803d1f05e3f42c6cec23ccad0561caa7818ce31d71614

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