Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be565c75fb10c8b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 10:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 917b4a09f68cb1e17b63828142c0ab0d SHA-1: 531e28979ad2a98e4bcee952a9ce284e451fda8b SHA-256: 4be565c75fb10c8b6e3bb45c90876fc6a6ddec7267f297acb9e7b18d7055ee5a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and contains numerous external URIs, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded content, though heavily obfuscated, suggests the document's purpose is to redirect users to potentially harmful external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=bhagwan+ke+bhajan+ki+ringtone PDF link annotation
    • https://cdn.sqhk.co/kisasizaro/2ja6jaI/deluxe_wooden_chess_checker_and_backgammon_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_602ef0296752d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5fd61314179d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_604639e27ae85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_602040d0dafaf.pdfIn PDF document text
    • https://lutavazakagege.weebly.com/uploads/1/3/1/3/131398084/1626444.pdfIn PDF document text
    • https://sulajaxa.weebly.com/uploads/1/3/4/3/134362611/eb63276e6dce2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_6044217cbd0bf.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/fiiieic/earthbound_walkthrough_ign.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/gewTlhc/business_letter_format_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_6006150b6dac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_60081c04836fb.pdfIn PDF document text
    • https://cdn.sqhk.co/novujarogoga/hvgig7L/spinner_battle_io_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_601a5be09d293.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/hjt3hhw/bazinukewej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woneketelak/42591805315.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_1ed0522c3610431cb90f5b9ea9ce06a3.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_c4ac53e843a74319a8de6c9fcb991288.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/jifupufibu.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_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 5160 bytes
SHA-256: 98683b9e7a4e11cfc4dd6357ee903ec7afb0d57acec0125aad1076025c42674f
font_01_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 10604 bytes
SHA-256: 27f0c4ecc1dc3cf5682214c51d4ff676a87f148ed0c7a90f0d32be83da459bcd

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