Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4db702168f0d78…

MALICIOUS

PDF

70.2 KB Created: 2021-03-20 06:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1256f92276295680b4ff56dbe0895fe5 SHA-1: 4f6aa484eee809d505c41c05c0436235ef250952 SHA-256: 5b4db702168f0d78ee8ce4bf349029a1ce7ef42bd70fcdfdd0e330062d9a6ec9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 'http://gejujebiwibi.epizy.com/metformin_dose_pcos_infertility.pdf'. Another link, 'https://jacksth.ru/wix?keyword=intro+to+rational+functions+worksheet', is also present. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution disguised as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=intro+to+rational+functions+worksheet PDF link annotation
    • https://cdn.sqhk.co/bezugisav/ulhamPG/87791996365.pdfIn PDF document text
    • http://novemipet.22web.org/63488578841.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/gjMlSgg/infinity_app_per_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/cefaIPt/fogobibasunum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejujebiwibi.epizy.com/metformin_dose_pcos_infertility.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_fa0de82cf5954b978234d674f2723c0f.pdf?index=trueIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_b85904f2aad64ea2a19dbaad72e7439e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/75182155541.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/wetter_30013_cavallino-_treporti_venedig.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/roku_1_2710x_specs.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_bf98909e0174403b92ff3e66799fb70f.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_7a46dd7dae6e45778ac3540f07ba5301.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/likofezupuzijotegemafu.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/mckinsey_waterfall_chart_excel_template.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_4258cbde77544c9a899e223b3302e5f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/aew_revolution_uk_results.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/reasons_school_uniforms_are_bad.pdfIn PDF document text
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_aa6d3df48f2349e98e08fefe3719d37a.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_77f0d047a649405da8ab3d488768c08f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/bilaspur_university_private_form_fees.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_a15ee3a321b24e81855042e23c50bff5.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_201bd2ee15274cdcb704f5dae6e4b47f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokamoba/kapakapamo.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/date_sheet_ba_2019_aiou.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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 5060 bytes
SHA-256: e03d2f4ca2c34a3ae412be3acc202b0ca57bedf06a902428343ebbd7049b7f7e
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 10196 bytes
SHA-256: 3be90a45434b1183a23e8a6872f0fac4df7667d875e93aaeda0901bd950a6b84

Open this report in the interactive analyzer, or submit your own file for analysis.