Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfc6344cfd303e5…

MALICIOUS

PDF

77.8 KB Created: 2021-05-21 04:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 90b47a66de374cace77a9936c825ebcd SHA-1: cee1095b6108465350213361f205336cccf3c1c2 SHA-256: bcfc6344cfd303e5c503cf272544520ecac4153066dc1d3062f0b25461017500
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a mass of external links, identified as a 'PDF_SEO_LINK_FARM', with the primary suspicious URL being https://resalured.ru/strik. The document body is heavily obfuscated and appears to be a lure, likely related to search engine optimization or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=how+to+process+deed+of+sale+for+car PDF link annotation
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/2048573.pdfIn PDF document text
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/3d999e2c9e51a68.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/325240.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tutasujal/553800347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac4f92e-6c90-48ea-8496-376e22645f79/femawemejofi.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/clavier_arabe_telecharger_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/gefomese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba663902-2f79-419c-97aa-6d4421a112f5/89746338011.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/8337182094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef8a328-593e-4d22-bb46-15f499b1cd65/what_is_the_average_salary_of_a_technical_writer.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/xatukebojidodudabewu.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/zatiropagobibex.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/earthbound_onett_theme_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/rifizapaxosor.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/sujugekefavonugokeg.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/17781676360.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/fotuxunuxuli.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/why_do_pimps_exist.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/kerugoxevaforaziwelito.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/66234344175.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/wupelovegetasoper.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 4836 bytes
SHA-256: fe43f33ba70b6f04ca26168c434b106deb42f3a0a945c83a30bfa6b8347e344c
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 11340 bytes
SHA-256: 8f006746d30467dc877e7a4ac4306ec591b8d0304fbd25c8ebe7b1762686b29d
font_02_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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