Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf16fe1154b49211…

MALICIOUS

PDF

78.0 KB Created: 2021-03-04 17:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a2f380e891f09b6b5bb591d88d69d70d SHA-1: 7c1cf52b00557727caa150b0c7b5eed35dd3f4bf SHA-256: cf16fe1154b492119637792c7db9b95c0b9d978aafb84d14eab37e1961ad4f60
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to a 'church member sermon series'. No scripts were extracted, but the presence of external URIs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/123?utm_term=i+am+a+church+member+sermon+series PDF link annotation
    • http://dumubemajizukov.medianewsonline.com/gabogowuli.pdfIn PDF document text
    • http://optalpha.com/sojikoloxd0viq.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/95440778335.pdfIn PDF document text
    • http://gtomishebs.xyz/9469221970141tmz.pdfIn PDF document text
    • http://reduslimitalia-official.site/46568634762tivlu.pdfIn PDF document text
    • http://zahlungsservice-ch.site/dajupunarivuxobibumwzwep.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/tekidutitexeginukobi.pdfIn PDF document text
    • http://4kuhd.me/daily_tamil_news_paperx2k28.pdfIn PDF document text
    • http://sberbank.services/44391074977a25mh.pdfIn PDF document text
    • http://reduslim-sito.site/37526281694xv92u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca9342e-d1e0-4878-9cf4-fd9f20e12eb5/greek_mythology_comic_book_series.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/16056286970.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/pidakidolotigame.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/ccna_lab_guide_routing_and_switching.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5a233a-f4e3-4f4f-b36c-650f5d6b6d50/31036709665.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/49077379100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635289b5-4780-4956-96d5-13e366369ae2/36857592070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d3d7c4-1df4-4d83-9d41-4ecd45d5afa6/lunuduxututosezavik.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/gekekasukogonobolelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a6e2fa-0d6a-411c-b45c-ff9d6eb15933/que_se_le_puede_regalar_a_un_ahijado_de_confirmacion.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/85438298535.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_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 5084 bytes
SHA-256: fbbd946bdd7bfaa2781c6a9eeecba15349cf7387bb8671be7c1bf45fa577ee74
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 10816 bytes
SHA-256: deea7e7f515ead095bc5e903a2468e7ee04655b0c960c7410d68a5b662135485

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