Malicious PDF — malware analysis report

Static analysis result for SHA-256 e223fedb0fd31c42…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 23:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b22a2260677495bc6c34fc48d7240736 SHA-1: dbfdb27d194146b0dd90264727a08b762c0f53cb SHA-256: e223fedb0fd31c42b82fb390209edd7938d5b64d8e92d2e7de42535e94dde6e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://ponafet.ru/wix?keyword=difference+between+worship+and+praise+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5fee72531e082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_6046bcab75fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_603299e7cda91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_602425643fda3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_5fd788e3be8f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_603da66e8b070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_601626f5602c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5fecad802a690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_60258c12a1cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_6032f3f45eb8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_601ae0c0599f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_602a0aa77e3e4.pdfIn PDF document text
    • http://xarapen.22web.org/lazulevaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454825/normal_5fd68b45de9d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vasugam.rf.gd/46295290435.pdfIn PDF document text
    • http://dalizavok.rf.gd/72608859603.pdfIn PDF document text
    • http://noxanaviki.rf.gd/3079120410.pdfIn PDF document text
    • http://lekedoxe.rf.gd/53330685646.pdfIn PDF document text
    • http://nutimuratibuzur.epizy.com/beginner_crossfit_program.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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5444 bytes
SHA-256: 5876b915e428658a871e3983d32b389ed165dc8915c769d32e44d677cf7f55d0
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 11148 bytes
SHA-256: 900fac23c9acb10fc7a9cef45b689da410bee6162143fe875db58385f635ade0

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