Malicious PDF — malware analysis report

Static analysis result for SHA-256 0895daa0880b170e…

MALICIOUS

PDF

76.8 KB Created: 2021-02-28 10:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ea643423d9359af7e2b6587b7387e257 SHA-1: cd370c3578c8f653f31cd1cc0e03bdc6d209cb48 SHA-256: 0895daa0880b170ec5de6ddd66a85f1a7754f5790beafffb0f9557844c5c8070
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is suspicious. The document body, though heavily obfuscated, suggests a lure related to 'simplifying radicals with variables worksheet answers', aiming to trick users into visiting the malicious URL.

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://zajinet.ru/wix?keyword=simplifying+radicals+with+variables+worksheet+answers PDF link annotation
    • http://sepoxudozixo.sportsontheweb.net/ed_sheeran_with_justin_bieber_i_dont_care_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483833/normal_600fa2023d194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5fe6bb614935b.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/33962855064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_6015cc4a7a6a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5fefd2084d0f4.pdfIn PDF document text
    • http://gufopitasuwo.22web.org/role_of_information_asymmetry_in_finance.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/perspective_projection_in_engineering_drawing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_5fd9019642b5e.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/18942180600.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/dowavelaxam/us_fda_bacteriological_analytical_manual_bam.pdfIn PDF document text
    • http://susabumo.atwebpages.com/nora_roberts_books_list_in_order.pdfIn PDF document text
    • http://renawexit.epizy.com/xusaxopemuwevekijariga.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/2019_buddhist_civilization_mcq_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/bomgar_session_recording.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/49509872918.pdfIn PDF document text
    • http://pewejexuti.rf.gd/zigodasizuliw.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/81856332188.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/silolikike.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/42672196151.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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 6132 bytes
SHA-256: 962ecd3afb2ee087ddfefd0cd05882074a827606cb4505ea4aedb9bc35c6f9d4
font_01_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 9884 bytes
SHA-256: 4c1da65535130bf7af2a0d77061098f3e79da1d1066f2be1e11f1a502042ba85

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