Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6d6a9a435654eb…

MALICIOUS

PDF

75.7 KB Created: 2021-03-23 14:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e7598a31ce63a58081bab73f2f0e88cc SHA-1: b0ea0bacfd500cbc05650e9980f1ab604730548a SHA-256: 4d6d6a9a435654eb2215b42e09f32db1fa28d9d70964bdef160916a0f606615d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

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://botokaw.ru/wix?keyword=one+fish+two+fish+spanish+pdf PDF link annotation
    • http://vizilirudigub.getenjoyment.net/cloud_security_alliance_cloud_controls_matrix_represents.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370092/normal_600497d573b4a.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/pevutexefaxodudutosekef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_6015da1b202dd.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/wao_anaphylaxis_guidelines_2012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454426/normal_60027ed91cf6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_601835d3d369b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_600c7b6db4b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_6031f793ed014.pdfIn PDF document text
    • http://xotekalulomeb.iblogger.org/animal_abuse_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_602ad24b313dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fe3f7c2dbec3.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/family_therapy_concepts_and_methods.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/farekebavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_461185cc875c4e04a5d448b3397bb27b.pdf?index=trueIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_10cd7c00e7d5439784267f22ed655d17.pdf?index=trueIn PDF document text
    • http://kepagewav.atwebpages.com/how_to_check_bp_with_wrist_monitor.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_87032ab6d251431fae0571b6f494bf8e.pdf?index=trueIn 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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 5120 bytes
SHA-256: 546d9dd20e756317ec353883253541001067176a931e582d4856252fecaea7a6
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 10376 bytes
SHA-256: 53ae2a262bfa5960b5babc707a149cd19761033e7383535ed1f7cefdc9632f08

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