Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc88e52c491074ca…

MALICIOUS

PDF

75.7 KB Created: 2021-02-26 14:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 49705799efd32b866e5cd2ff61f46afe SHA-1: 51ab5ea5aa2b4f487663254631f28513b6ef2b46 SHA-256: dc88e52c491074ca08d80628fcecde2a6de242304e0b4e28c4cf027df528365d
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely a malicious domain used for phishing or malware distribution. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick the user into navigating to a harmful external resource.

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://zajinet.ru/award?keyword=how+to+reboot+dish+tv+receiver PDF link annotation
    • http://usejus.pro/laxiveg3qqew.pdfIn PDF document text
    • http://olipaka.xyz/rekuwuriberosimiysdqr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_600c273eb7b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_6004ae98d0078.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/mokamoba/what_is_the_major_theme_of_the_book_of_daniel.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/17294854710.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/juderedototokop.pdfIn PDF document text
    • http://zotebizitiwiwe.epizy.com/fipafuwufotoximomukuj.pdfIn PDF document text
    • http://limebeb.epizy.com/free_printable_algebra_worksheets_ks2.pdfIn PDF document text
    • http://kidogip.epizy.com/vba_application._worksheetfunction_list.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/bootstrap_4_navbar_template_with_logo.pdfIn PDF document text
    • http://fosekor.epizy.com/google_classroom_apkmirror.pdfIn PDF document text
    • http://jupanadipi.rf.gd/dobonujoxurugesamo.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/outlook_application_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/gudofarusogelubeweg.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_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 5040 bytes
SHA-256: 1f42774e21b73e801d984c532f07e38faf905694d9ea2b41e2208107b4bf7ed2
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 10208 bytes
SHA-256: c91b444236c23a6e0ca561a93fcb67e79670fb3e466c90b21baec0dc953fa2a4

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