Malicious PDF — malware analysis report

Static analysis result for SHA-256 5655f9c2df8518e7…

MALICIOUS

PDF

75.3 KB Created: 2021-02-23 15:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 433a8fe5088ed024647886583fa70861 SHA-1: 2663d19bfc8650d36fbacc09061b1442134c0e65 SHA-256: 5655f9c2df8518e72a4f01bc36d07f970f3b3efe43d2eaea4f3580723eb8ecc5
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a site related to 'artificial neural networks definition', likely a lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI suggest a phishing attempt to redirect users to a malicious domain.

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=artificial+neural+networks+definition PDF link annotation
    • http://paktum.pro/d-link_dcs-930_lbugmv0.pdfIn PDF document text
    • http://smartline58.ru/74717703495hauqp.pdfIn PDF document text
    • http://czecheducation.space/ccdc_23dwauf.pdfIn PDF document text
    • http://pubggaming.online/helicopter_gunship_strike_hacktc3tn.pdfIn PDF document text
    • http://daravto18.ru/battlefield_1_planes_guidejmw72.pdfIn PDF document text
    • http://fastpysystem.online/51679354690h0moh.pdfIn PDF document text
    • http://dvestideyli.xyz/dapawopatajaco9.pdfIn PDF document text
    • http://comp-arenda.site/big_bang_theory_cast_missyx8gf2.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/sefiwegegagu/mandated_reporter_form_nys.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/kepizel.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/80609876462.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/bozajiwofaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/oracle_sql_developer_code_formatter.pdfIn PDF document text
    • http://dojeranorered.epizy.com/7234277107.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/79819850066.pdfIn PDF document text
    • http://zizokeb.rf.gd/math_worksheet_for_10th_grade.pdfIn PDF document text
    • http://zufagubiles.epizy.com/anomalie_de_liquide_amniotique.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/free_corporate_email_newsletter_templates.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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 5160 bytes
SHA-256: 77069ea5b3e4a7fc6c25ecae88710b6a6376ea0d3ef027b9f211c087ba14fea5
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10376 bytes
SHA-256: a850a0cc0b9bb42cf189786b9ffcc05e70f06c2828aedb2980ae0efcdfe3af7c

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