Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f493d9af115c806…

MALICIOUS

PDF

76.2 KB Created: 2021-02-23 14:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 737c3c3410265c17709b7ceed4c0476d SHA-1: 137e27d4b490f0cc883871e814c5a657502f4edf SHA-256: 7f493d9af115c806c7849babc2a432bf5bb3ac8bc44a9eed904dd9f303bb3d49
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'link farm' and a phishing/trojan detection by ClamAV. One of the embedded URLs, 'https://seumenha.ru/wb?keyword=download%20film%20the%20chronicles%20of%20narnia%20the%20lion%20the%20witch%20and%20the%20wardrobe%20', suggests a lure to download content. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with the ClamAV detection, strongly indicates malicious intent, likely to distribute further malware or conduct phishing. No scripts were extracted, but the structure and embedded URLs point to a malicious document designed to trick users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://static.s123-cdn-static.com/uploads/4370319/normal_600103d28cfae.pdf In PDF document text
    • http://dfds.in/proof_by_david_auburn5e0af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5ff4f9a1e232e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501634/normal_5ff1897ddb35d.pdfIn PDF document text
    • http://shopwithsale.website/bently_nevada_3300_xl_wiring_diagram5yyj2.pdfIn PDF document text
    • https://fomoxejuj.weebly.com/uploads/1/3/4/0/134000143/fujivozadifepem.pdfIn PDF document text
    • http://top-agent.ru/vapesurnkd6.pdfIn PDF document text
    • https://zibomuloxeju.weebly.com/uploads/1/3/2/8/132815028/xulepopufadibisuf.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/82b500456.pdfIn PDF document text
    • https://seumenha.ru/wb?keyword=download%20film%20the%20chronicles%20of%20narnia%20the%20lion%20the%20witch%20and%20the%20wardrobe%20PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/cartesian_form_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/77072043772.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/wefamevidevosojefo.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/zalolam.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/new_barrackpore_municipality_admit_card.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/fasafef.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/mzansi_afro_pop_beats.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/free_printable_phonics_worksheets_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/acclimation_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/zariritujivemefegolod.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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 6044 bytes
SHA-256: 4b728c00dbaac48baf938b0435daee0b72498ba076355d7bb0bc09b0f28c83ee
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 10972 bytes
SHA-256: f442f6f4bb650c173eb7ff7a81d9088502809e5e9122f0b61b66f1e3c9f9a681

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