Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4fccd776a85ee8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-09 17:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1d796d6ac69061ae59e28f4b4984973e SHA-1: 059f6a7a4c98fc6bcb37ff7db2c09f6ccad69290 SHA-256: 9f4fccd776a85ee861748d10133329cb3cb63fc6681f44a5793c937f6327f0a9
96 Risk Score

Malware Insights

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

The PDF document is disguised as a GMAT sentence correction guide, but contains embedded URLs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site.

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://lozipotod.ru/strik?utm_term=gmat+sentence+correction+questions+and+answers+with+explanation+pdf PDF link annotation
    • http://datujizid.iblogger.org/daxuwapakojuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458163/normal_600203f0bf850.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/1637624927.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/how_much_is_carlton_cole_worth.pdfIn PDF document text
    • http://jawigonoputumun.iblogger.org/diary_of_a_wimpy_kid_double_down_book_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384299/normal_5fceaf626d546.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/navoburarovada/alimentos_transgenicos_oms.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_48831e887bf5411bb94c76062656e149.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_11a87a197ae64e03aaf8997a798326cb.pdf?index=trueIn PDF document text
    • http://wojudor.epizy.com/column_addition_sheets_ks1.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_8a55e789323940bebb254d97965e9488.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_7c989a4df32746a39bda0d13d6f7dadb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/share_sale_agreement_template_malaysia.pdfIn PDF document text
    • http://luvigewe.rf.gd/25940142607.pdfIn PDF document text
    • http://fajegefifozibe.rf.gd/light_oak_study_table.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/66886983360.pdfIn PDF document text
    • http://luxusuriva.epizy.com/absenteeism_policy_template.pdfIn PDF document text
    • http://rabijeno.epizy.com/34985447102.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/what_are_the_best_quiz_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/the_real_book_volume_1_6th_edition.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_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 5712 bytes
SHA-256: 6316277829cde63debd50c6bd81a493c6477e7bd2fa46b06ee3739665923c5ff
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10408 bytes
SHA-256: 658a6eaa473ad4df310f2519c9897c3c489fede2aea3fdfa5f1269c5605f29ff

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