Malicious PDF — malware analysis report

Static analysis result for SHA-256 0064d876ce5bf373…

MALICIOUS

PDF

82.8 KB Created: 2021-03-21 08:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba8d049dd1d1a06f7fc95528a1730886 SHA-1: 7f7d5c79ec69f007b8f038cb7777a5ef48cb65ac SHA-256: 0064d876ce5bf373807176c84deddd58463880d7ba87e5a1bc44a560a736bfab
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The embedded URL is likely intended to lead the user to a phishing or malware distribution site, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=problemas+culturales+en+mexico+2019 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fe33fc29f15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_600f2ccc3bf20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479454/normal_5fe3ec00129c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fff695c9a48b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_6000771157a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_602d8aaf27365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454300/normal_604ecf46d6c97.pdfIn PDF document text
    • http://narelavupes.22web.org/quiste_renal_clasificacion_bosniak.pdfIn PDF document text
    • https://rawesare.weebly.com/uploads/1/3/3/9/133997405/ludutadakanujedijavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_60282ccea733a.pdfIn PDF document text
    • http://wabuxon.iblogger.org/bruce_lee_songs_starmusiq.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/936b74c8e2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388421/normal_5fc746d6c524b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_600a492a34412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/anemia_menurut_who_terbaru.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_3330557f88da4bf298fa0e26df01d5cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goviwigax/humidifier_rated_best_consumer_reports.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_9063befb594a4554b8ac0dd4d2fca6cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/tixoremosukop.pdfIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_23c618f4df02419a80ac5bc19fe8586a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/22348047370.pdfIn PDF document text
    • http://gujivixamiwol.rf.gd/68490245954.pdfIn PDF document text
    • http://vejimugar.epizy.com/arqueologia_de_colombia_un_texto_introductorio.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/brakeman_report_2006.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_a1c53475d4a340be8d939d99f8c65832.pdf?index=trueIn 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_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 5636 bytes
SHA-256: f1bc5511eed2c8ad3628a59bf52432bb3bf0aafd6098533833fd23764a054a8b
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 11944 bytes
SHA-256: b580a525351766dedf4150610f525bf13ade6b69360d101450457bac5b5867d7

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