Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fe7a893df9450a…

MALICIOUS

PDF

80.6 KB Created: 2021-02-24 21:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a0389bda4bfc32059d6a9d8bffafd3f8 SHA-1: 4bd96d745bc3cd73e40555042392e313e335bc51 SHA-256: 30fe7a893df9450a93f951c3ec9453cbcc71861c145bff909530fa552da0c8a4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized PDF files on various domains, suggesting a link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=prime+numbers+1+to+1000+in+c PDF link annotation
    • http://ek-arenda.ru/how_to_write_a_guided_textual_analysis9xp4g.pdfIn PDF document text
    • https://vawavujak.weebly.com/uploads/1/3/4/3/134350312/1264913.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/gekefavamomuk.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/dipudopekojesal-sadas-rupuxisuj.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/teoria_atomica_de_dalton772ls.pdfIn PDF document text
    • https://vopemafewiza.weebly.com/uploads/1/3/1/4/131408930/7134654.pdfIn PDF document text
    • http://dontbeshy.xyz/boss_tu_2_vs_tu_3_bufferoc6wv.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/tuesday_with_morrie_movie_online_free.pdfIn PDF document text
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/4741741.pdfIn PDF document text
    • http://amsidgi.xyz/68404553264nfie.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/zaviporelupi.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/b48ff818242026.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/wovitiku/ecosystem_worksheets_for_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/powideposofoboborowuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/bihar_b._ed_application_form_2018_online.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/demezinojaturafabu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/44931745081.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 4920 bytes
SHA-256: 16e1b8fb4607b7956ee3f97d7b9d89871b3890fd996009182b3120cbaa96d2a0
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 15208 bytes
SHA-256: 550385972e9ec9604eb92c7526586e43625943c9366056d993cc9a6b83801f52
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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