Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0d01da00847abd…

MALICIOUS

PDF

71.0 KB Created: 2021-02-17 12:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 755d6a691fa452712faccb04e126200c SHA-1: 222fe173e3a3ebbce2bcf685b86a1e8e0ca5a7a9 SHA-256: 8d0d01da00847abd7a577ac3d7eef1f97596d0532a6a4c69ff27f1d9d0fc8853
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jacksth.ru/123?utm_term=what+they+didn%2527t+teach+you+at+harvard+business+school+pdf', which is likely used to deliver a phishing page or a secondary payload. The document body, though heavily obfuscated, suggests a lure related to business education.

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://jacksth.ru/123?utm_term=what+they+didn%2527t+teach+you+at+harvard+business+school+pdf PDF link annotation
    • https://cdn.sqhk.co/farukisinu/iXohhid/10915265599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5fdadf5900557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff634c04fd5c.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/hioiihc/azamara_club_cruises_logo_vector.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365570/normal_5fc6d8de8bde8.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/jefazaxal/30956746523.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/bearing_design_data_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/fcpx_intro_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/22019603720.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/40977629498.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/valkyrie_connect_awakening_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/payment_request_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/kuwej.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/precipitation_reactions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/9952778323.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/bonuxufubasoxipotipokol.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/elastic_vs_inelastic_collision.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/shapes_of_molecules_chemistry_worksheet.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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 5592 bytes
SHA-256: d715b3d103fe7901843fdfaf1af637143343fb35f3d6c60628077b5b9d8e26f4
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 10080 bytes
SHA-256: 7efb3622b09af85f8fe41b7db77bc146544e772db226b792ff6280462d466e04

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