Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba81b2cfdba2f22b…

MALICIOUS

PDF

91.4 KB Created: 2021-02-09 23:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dcb9bc628a08728810db06a2b35e23a7 SHA-1: d6e574c85aa595c0e19a50837bafd600df7d2127 SHA-256: ba81b2cfdba2f22b05d0e7f2f7b87c80910f4f434710ffbe877dba81af34ea40
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'bologen.ru', which is flagged as a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=circles%20angle%20relationships%20kuta%20answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403556/normal_600fa7ee3a7f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5fd7856f65e13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5ffeff71de2a3.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/gjcibge/oscar_health_plan.pdfIn PDF document text
    • http://juxoxelobonoje.22web.org/wobipimizoguvaxop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawofepak.epizy.com/33662524577.pdfIn PDF document text
    • http://pupekafujobuda.rf.gd/55923418314.pdfIn PDF document text
    • http://risuveliki.rf.gd/vigo_apps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/xuxezulumerorur.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/alcohol_120_free_full_version_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/386758737.pdfIn PDF document text
    • http://magivaxinel.rf.gd/math_kangaroo_usa_2013_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/agario_mass_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/commendation_letter_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/51309905333.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/gebakojug.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/13848168597.pdfIn PDF document text
    • http://lodusebivepakef.epizy.com/dexakajerigavesifavisilu.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/wurazododijakagadusomev.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_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 5256 bytes
SHA-256: b7ff9e399abeab4f3013eeb18dae6d59066b18191f25b3177befc6ae1a13979c
font_01_sfnt_off00013619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 12632 bytes
SHA-256: e399ca058ead724b0e9d5e44815310c747dc92899997b74fbe03c6a407c05ed3

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