Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f4eafd30c07d72…

MALICIOUS

PDF

87.2 KB Created: 2021-03-08 12:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e74a908aeae19b9014849f53a62cf8af SHA-1: 20c25dd00f84a6bd162942227f0a1a554b590270 SHA-256: b1f4eafd30c07d72480ea2f20485a5130051f7efba86cc0ff2988a289f411f73
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or content-scraping attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is obfuscated, but the presence of embedded URLs and the link farm heuristic point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=what+are+three+interesting+facts+about+greece PDF link annotation
    • http://shop-profildoors.ru/kreepy_krauly_pool_cleaner_replacement_partsudawd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5ff9f00dad312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_60246b0281de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_5fef3f999a124.pdfIn PDF document text
    • http://yourbigdick.space/telehealth_by_simplepractice_for_macxsily.pdfIn PDF document text
    • http://copyright-help-report.com/58856324968fnnh6.pdfIn PDF document text
    • http://kernig.pro/birixuvowomagutua1tsf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453891/normal_5fcd375cefdbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_603f1123842cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ff7bae107993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_601f3a08e1c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6011e261b368f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6028942d1cfb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_600fbcdac9480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5ff38bd752de2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fc6de820bf19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fee499069863.pdfIn PDF document text
    • http://sosiwuro.iblogger.org/40901878306.pdfIn PDF document text
    • http://zoomita.space/college_website_templates_htmll9f4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedogevakubonog.epizy.com/63600603.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_cfbb546c58ce4861b251bc61d5bf7441.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_d17a722618a940899ea2a4af7265f0c4.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_8cbdf1c2ed8e4a5d9d5334550df92dcb.pdf?index=trueIn PDF document text
    • http://lobivovakebala.epizy.com/bars_and_melody_songs_hdvidz.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_2d770496f7fb4b5b8f1d5f4d9686a5d9.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_5ad523c89da143238122643325caa0a2.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_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 5264 bytes
SHA-256: 815ddf7ca699b144677f6f46b8f1d74a078bec2ae9461d3badab6251809edab3
font_01_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 12252 bytes
SHA-256: 3094ef354ae502c5c25dc3b45038f6735d1d96defd819d85bc4b03bc10668e45

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