Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7173c28a42e55bb…

MALICIOUS

PDF

87.7 KB Created: 2021-05-01 13:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dc20241b7b19bc55060c1d72cfbf4175 SHA-1: 9b664694b6794db791e13db6549d7d2f4376d50f SHA-256: b7173c28a42e55bb26db8b5f56488b6d925d6f4f5323f8818d3b5f6e98ebe8cd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier. It contains an embedded URI pointing to 'https://soxebez.ru/strik', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, contains text related to a textbook search, reinforcing the phishing lure.

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://soxebez.ru/strik?utm_term=pearson+college+physics+textbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490934/normal_5fe3688350744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_6010a65260e74.pdfIn PDF document text
    • http://segway-wheelchair.ru/speed_queen_washing_machine_prices_makrobpj4b.pdfIn PDF document text
    • http://paksorond.xyz/zamefamozejuremuwumokekid38rd.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/mobupodexegupepisisu.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/ePehgPO/vejevimedi.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/7hezicr/hsbc_coin_counting_machine_near_me.pdfIn PDF document text
    • http://azakalaza3.xyz/tivudagumumobasamunagaf27gf.pdfIn PDF document text
    • http://sallles.ru/xosoludipatidejatibolofby4b9.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/icij560/79191196611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_60280774a94e9.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/bdidqsy/72316998183.pdfIn PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/year_5_creative_writing_worksheets.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/tobaziw/the_umbrellas_of_cherbourg_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/crystal_report_in_visual_studio_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/sensongs_la_telugu_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/internet_manager_firefox_60._0._1.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/fobuxomuzutoseralafoxe.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_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 5792 bytes
SHA-256: 5cdcb3af5ae2fa6b238cbb6ddcce3c7f0e3041f51d907c3266992146862f4153
font_01_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 11132 bytes
SHA-256: 8f604454101f413a16d9b6abde252c409b252c9bfa55aa8c96722d17421f9f40

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