Malicious PDF — malware analysis report

Static analysis result for SHA-256 effe93a3f2a0f554…

MALICIOUS

PDF

94.5 KB Created: 2021-02-11 00:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e1876d2915ff4a38124d9a5e78b7570a SHA-1: 9c555cd1e5de1b48871aa7a1eabb6d6abbfc6812 SHA-256: effe93a3f2a0f554c87ad9627d392d53d5be993e871ea206b99794d891f07daa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=ibc+coaching+5+linguagens+do+amor+teste PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fff5754b7571.pdfIn PDF document text
    • http://extrameets.fun/votaninoyu5b.pdfIn PDF document text
    • http://swiss-gear.shop/tabla_periodica_a_colorts3pz.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/dgcjerd/37616311416.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/DgdFghY/business_manager_resume_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/jjigii6/lusizimiletuja.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/jisufiw.pdfIn PDF document text
    • http://dolobovofozuz.22web.org/winky_wonky_donkey.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/64415317518.pdfIn PDF document text
    • https://ragurukenawuxif.weebly.com/uploads/1/3/4/6/134667210/zawegif.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/7301417.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/gjg8icr/bipibufono.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/vasofirida/5842133082.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/5471272749.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/el_segundo_arco_faringeo_forma.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/graphic_designer_portfolio_examples.pdfIn PDF document text
    • http://repeputowuz.epizy.com/ambedkar_law_college_chennai_application_form_2018.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_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 5552 bytes
SHA-256: 3ebf5b4d0b634a4dd702333e320476fadaa204f4651ac29df60476edfef36bfc
font_01_sfnt_off0001469c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469C 11468 bytes
SHA-256: 6181b2d487dd28bb5a840ec59e40a2851a7b9f8bbead353a9e2e6caf2e5fcfee

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