Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5de10646b9472e…

MALICIOUS

PDF

77.8 KB Created: 2021-05-16 00:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2970253cb9540a40d94fcbeff44c7b73 SHA-1: 99c49e18c34087b48cb374a01240fc87e8a1783c SHA-256: df5de10646b9472e69e2ccb8348510da4a2af7b5f67cebca3d1ef7892a61cc10
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the presence of URLs like 'vilenefex.ru' and 'ueuniti.website' suggests a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=goodwill+donation+drop+off+box+near+me
    • http://ueuniti.website/smash_bros_ultimate_tier_list_august_2020nule1.pdf
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5fd07265ab524.pdf
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/tanopusimedon.pdf
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/fadogaxulafaze.pdf
    • http://foyou.store/sibuvujoxesz7z0x.pdf
    • http://cmbespaceclient.xyz/latugmgya3.pdf
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/af49314e2b5914.pdf
    • https://vinovebavelugis.weebly.com/uploads/1/3/1/3/131383284/11185db74c.pdf
    • https://cdn-cms.f-static.net/uploads/4473023/normal_6063a175a7194.pdf
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/3699165.pdf
    • https://mitamegupep.weebly.com/uploads/1/3/2/3/132302953/maxosi.pdf
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/8322160.pdf
    • http://baby-slings.ru/the_dhandho_investor_bookpcquj.pdf
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/naposoj.pdf
    • http://wowitaly.space/89756820687vse0.pdf
    • https://bebujufexuxiki.weebly.com/uploads/1/3/4/6/134624407/460993f.pdf
    • https://siselujasukoju.weebly.com/uploads/1/3/0/9/130969984/520513.pdf
    • https://xefobizedep.weebly.com/uploads/1/3/1/6/131636625/1790042.pdf
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/541549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/197ffd31-7f1f-4cbc-b93b-4fe59a85c8fc/how_do_i_delete_santivirus.pdf
    • https://uploads.strikinglycdn.com/files/acd49d3f-d036-444f-b9d2-bc2bcc95a399/mumuwi.pdf
    • https://uploads.strikinglycdn.com/files/7db9e22b-9e1f-4c72-ab5a-d59bbc2097a2/what_is_operations_management_essay.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f439.bin
2c9b0e66c28c05bd4800186332f5b6621ac5578652bb18d0194eca9ed6fb2122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5340 bytes
font_01_sfnt_off00010664.bin
421415e19454238379f948eeb4994d6e1184aa6e497d9a09f38b63d75cdbc101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 10520 bytes

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