Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb481b535b14722…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 18:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2ec0549e8df45a2703cefb6993bf2b48 SHA-1: cc97b22015bfa355c60df3e7f4e03834f7c6585a SHA-256: 9bb481b535b1472287222e86e5ed98937f49377331f4bc7cd18030ed4741464f
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing lure. The document body, though heavily obfuscated, suggests a theme related to 'bird nest types pdf' and the authoring application indicates it was generated by wkhtmltopdf, often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=bird+nest+types+pdf PDF link annotation
    • http://acgmgroup.ru/37679168499ytmrk.pdfIn PDF document text
    • http://megalit-korolev.ru/fibulutistykku.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/zoduzerofug.pdfIn PDF document text
    • http://zyzycheat8.xyz/traducir_del_espaol_al_portugues_de_portugalz5w1l.pdfIn PDF document text
    • http://birapemotafew.mygamesonline.org/35971777945.pdfIn PDF document text
    • http://novoruxove.iblogger.org/hornady_ballistics.pdfIn PDF document text
    • http://nikecortez.net/917590519028k0ro.pdfIn PDF document text
    • http://sixawuragime.iblogger.org/balu_telugu_movie_bgm_free.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/siloxuwixuxogtpq7.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/webipejonavuv/cloze_worksheet_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/crafting_guide_dayz_standalone.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/blank_parking_ticket_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/sorataragegedenunitopib.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/letter_drawing_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/english_grammar_betty_azar_fifth_edition.pdfIn PDF document text
    • http://volemefejosi.rf.gd/70068306140.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/77945152053.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/home_medical_alert_systems_consumer_reports.pdfIn PDF document text
    • http://vifebekomese.rf.gd/30357502563.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/88747310432.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/35724374654.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_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 4944 bytes
SHA-256: 0dcbc6f10de4cbe92f54a10f0c893c4cba8728d8e669f988dfde7aa063501f9c
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10840 bytes
SHA-256: 6561905fd2f65f2f7a1dbbdd6987201ed4f0f42cdf88de3400b8b330eebd6638

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