Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9c28f4520b0fc7…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 13:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0d43a772b01b6aded9fad5451dd08d2 SHA-1: ed3090c175c1a9315964b8becae7e8e1ae4d2f8a SHA-256: 3e9c28f4520b0fc705c51542ba7a2088c4ff2ef41c604fcc98117d1335d888ce
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. 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 0.9996

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mezovuduw.ru/123?utm_term=html+email+invoice+template+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5fc6d79587b78.pdfIn PDF document text
    • http://kodavuviguwu.mypressonline.com/rubezomexiriw.pdfIn PDF document text
    • http://formblckr1.xyz/oxford_english_learning_centre_karachiyyl55.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/rawexar.pdfIn PDF document text
    • http://load-bcp.com/451581754762p4uf.pdfIn PDF document text
    • https://vizexetu.weebly.com/uploads/1/3/4/8/134864552/wamavuranatafixot.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/lipuvapopoxabiwamow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_601ae2a80ce63.pdfIn PDF document text
    • http://fitit.space/94974646103kux3i.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/rameri.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/windows_command_line_tutorial.pdfIn PDF document text
    • http://kukushka.space/90873675550huge5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600a9ddaa9ce9.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/pokaseduxafubarapawa.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/gigujonusupixazov.pdfIn PDF document text
    • https://padubutidosose.weebly.com/uploads/1/3/3/9/133997835/sixuvev.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/as_bases_quimicas_da_vida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/53875806694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6821b3f9-67bf-493f-a7e8-ada4f205c46e/dynamic_tension_exercises_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77857c55-ca9c-4a04-8678-bbd7a6fcb152/41419910192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c72d60b-9e89-4145-afce-8faf4bcdf3d2/gumefepug.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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 5004 bytes
SHA-256: d5143a001a864747af6d98f82f568d14c72967aa59407b68d294d6a63e96ba02
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 12228 bytes
SHA-256: 5e614f0f1b6e1e8d4feaef1e392367f0be17b9231b82e9ab290d0c67fe7bfcc9

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