Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b06dbffbc6de5c3…

MALICIOUS

PDF

70.2 KB Created: 2021-02-15 05:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 29abc3bfc6c621dad4a78a86598f0876 SHA-1: deeaf96f53aa5948bbc94e7a94296e55847691b7 SHA-256: 5b06dbffbc6de5c37cc02df029bc90d8efa0f701143b6397fd3d00532b8c7876
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=descargar+50+sombras+mas+oscuras+mega In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403128/normal_5ffcdfa949a77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461516/normal_5fcda31ccf4dd.pdfIn PDF document text
    • http://vkrowl.com/numilunifetukijadnun9o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_600a4dc26aace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6022a90507845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikofus.epizy.com/sikh_minority_scholarship_form_2019-_20.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/fumobevixuru.pdfIn PDF document text
    • http://mufumeg.rf.gd/59506356108.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/technical_drawing_for_fashion_book.pdfIn PDF document text
    • http://fakozavovenabe.rf.gd/esl_holiday_worksheets.pdfIn PDF document text
    • http://kijemuf.epizy.com/achieves_bullets_for_oer_support_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/91719473335.pdfIn PDF document text
    • http://negekipewunej.epizy.com/bivaxesosewuwez.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_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 2868 bytes
SHA-256: 961dc1380210bdc02715716d6a7e97355048e34260408ad82901b2fe81a5fac4
font_01_sfnt_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 5492 bytes
SHA-256: e7cbdc9350c7ac2da235b33e86b96668e4eb11ac9aed09093aac1741a2fe6a6d
font_02_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 11264 bytes
SHA-256: 1b5a84733e50e920e0d5f3415feb649d80043a65947bd6ac71c78424a3124efc

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