Malicious PDF — malware analysis report

Static analysis result for SHA-256 f933ee28c8d1bbf4…

MALICIOUS

PDF

89.2 KB Created: 2021-04-20 12:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b2b26c5a526b4759b516dd381b766be3 SHA-1: 6ae1ed8d34927d248e019c03ee27e4808d9d0adb SHA-256: f933ee28c8d1bbf4133c3a42004e9631b768390677b32d1aaa45ef621bb0cadf
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with specific heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, particularly the one pointing to 'resalured.ru', suggest an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=is+innisfree+a+korean+brand PDF link annotation
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_60149fd5b368e.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/8252365649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_60550bf0e1f0d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • http://vesixadaw.22web.org/sokafari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fccb38a222ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_6026ac9f5de02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6015aa61576ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_6068c5f06e5ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefumus.rf.gd/2004_lamborghini_gallardo_for_sale_uk.pdfIn PDF document text
    • http://kavaxix.rf.gd/tokaxosidijovijadaxovuga.pdfIn PDF document text
    • http://regujag.rf.gd/mopewe.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/mobivapamudamofumidonif.pdfIn PDF document text
    • http://lomaxunofixise.rf.gd/xorewatigulesuwovovoku.pdfIn PDF document text
    • http://fobapisarut.epizy.com/free_halloween_worksheets_for_preschoolers.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_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 8700 bytes
SHA-256: 03e1b95d8158ba62c8bba2875569de482792e34d55953bfe691125b93333a5a3
font_01_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 5008 bytes
SHA-256: 9abee0af22462678f2ecc7c9f1821307e31fae6f195a2a4a9443c04ca814206c
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 12832 bytes
SHA-256: b27d5bbbc54c3b9468bc1a5b3f2639418d3835a3eb8476a3241d579947e07795

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