Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca00220da1c7dc3e…

MALICIOUS

PDF

63.8 KB Created: 2021-02-24 00:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0771f17bc26c64fead1dac64b81ed0f9 SHA-1: 8db7a534e1e926e41616bc1fc265ab1a6005560b SHA-256: ca00220da1c7dc3ef72932979b81bbacae680b1fbfaae6790320ee6e50fce6b0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring 'printable pronoun worksheets 2nd grade' in its UTM parameters, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=printable+pronoun+worksheets+2nd+grade PDF link annotation
    • http://copriyghtconfirmed.com/caanz_financial_reporting_handbook_2019q6wt5.pdfIn PDF document text
    • http://italiahot.space/48553135696ngumk.pdfIn PDF document text
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/verokobasowu.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/3274896.pdfIn PDF document text
    • http://maporirunigis.22web.org/can_i_terminate_my_car_lease_due_to_covid.pdfIn PDF document text
    • http://sputnews.com/sowewelozazositojekikevei0bga.pdfIn PDF document text
    • http://sushibara.net/35291194684i0752.pdfIn PDF document text
    • https://xatotowo.weebly.com/uploads/1/3/2/7/132740458/5137988.pdfIn PDF document text
    • http://nudistoff.club/facebook_canvas_template_psde8oiu.pdfIn PDF document text
    • http://meboxofunufox.iblogger.org/97945496347.pdfIn PDF document text
    • http://maxist.ru/67334949663ggpop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugujegezamuto.epizy.com/caser_seguros_annual_report.pdfIn PDF document text
    • http://xegiseko.epizy.com/entry_level_accountant_resume.pdfIn PDF document text
    • http://luzasuzudi.rf.gd/all_in_one_er_apk_old_version.pdfIn PDF document text
    • http://luzirilokupozar.rf.gd/hipaa_compliance_report_example.pdfIn PDF document text
    • http://kojokijekuwug.rf.gd/us_soccer_grade_8_referee_exam_answers.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/guided_math_workshop_laney_sammons.pdfIn PDF document text
    • http://voxotili.epizy.com/wedatewolazavo.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_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 5652 bytes
SHA-256: fd0edabe869589ab40dc7780a9ed790cdda81f7f0b49253ead12056d8761d1be
font_01_sfnt_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 9392 bytes
SHA-256: 79101594b72f4ba0f4a0892ec856a34de84d489a1712a940f388e2ab03da252e

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