Malicious PDF — malware analysis report

Static analysis result for SHA-256 028d4c02a8783684…

MALICIOUS

PDF

87.9 KB Created: 2021-04-06 21:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6a2c7a560005b795860bb8d6e99af2db SHA-1: 18a2619284a163a50b2c60049298e768de75cf08 SHA-256: 028d4c02a87836849fa4154a1e4119284e5a67fe9f2d3919bd92ca509a181536
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/award?keyword=arminianismo+wesleyano+pdf PDF link annotation
    • http://noncomform.space/tudijojixeturotw3bdw.pdfIn PDF document text
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/8544820.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/jetblue_airways_case_study.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/vizux.pdfIn PDF document text
    • http://pelistens.xyz/dijelaxamupifefavc1dd.pdfIn PDF document text
    • http://apple-fruit.space/vadasakukikeserezkc55.pdfIn PDF document text
    • http://ig-copyrightviolation.com/76003576234s0zsr.pdfIn PDF document text
    • http://investmag.org/how_many_ragas_in_indian_musick6kgp.pdfIn PDF document text
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/reguteximemezumema.pdfIn PDF document text
    • http://daliadiago.com/what_is_honda_a13_servicedafek.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/zojugowavukiri.pdfIn PDF document text
    • http://vuvabadiredowa.getenjoyment.net/ziwimiximogatazorex.pdfIn PDF document text
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/535fe439.pdfIn PDF document text
    • http://tesar-krd.ru/332516243964f6x7.pdfIn PDF document text
    • http://begetus11ppz.xyz/html_css_javascript_portfolio_template47mtu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosipasakuvil.myartsonline.com/basic_computer_science_mcqs.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/94623929815.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/36754442595.pdfIn PDF document text
    • http://roveramo.atwebpages.com/kagoguzopexasudelesa.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/grok_learning_answers_html.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_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 5372 bytes
SHA-256: 10a68892087c232917690ea92c7c2b6f2027bba3f8e312cd9e4e9e2ac005c2d6
font_01_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 12600 bytes
SHA-256: 91173aff3ad213e8ed9adb57a92c4d47ef598272e7a678a03f850f977954859e