Malicious PDF — malware analysis report

Static analysis result for SHA-256 85465e782ac7ff36…

MALICIOUS

PDF

73.9 KB Created: 2020-12-17 22:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4386d778ab25185be8f4f42e0f366d2c SHA-1: 74f1c456108cead3a1a1d53ffc47f5874998aef3 SHA-256: 85465e782ac7ff363a34d44ed26250cda39c256bc52ef272eb972ffe0a4c66a7
252 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/aws?utm_term=android+emulator+bluetooth In PDF document text
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/79652.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/1400003.pdfIn PDF document text
    • https://zuforupixonop.weebly.com/uploads/1/3/4/3/134394080/7612715.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/fanuxevag.pdfIn PDF document text
    • https://semefaperovupiw.weebly.com/uploads/1/3/4/5/134507497/4204062.pdfIn PDF document text
    • https://buvojitode.weebly.com/uploads/1/3/4/6/134630820/bomosoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc6d00a6879d031da0df63f/t/5fcee5abb8233e30df9ce217/1607394732949/vakubigufokadunupunen.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/google_chrome_os_iso_file.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/paas_aao_song_pagalworld.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10dd588c99b6d37a7fa85/t/5fd19244ac13f65f660e28ef/1607569989264/plants_vs_zombies_xmas_download_mac.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe12abcb3e0f5771166f7d/1606292140106/dsm_5_specific_learning_disorder_diagnostic_criteria.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_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 4900 bytes
SHA-256: 70a2f611dbbb6930d9c5d938228fac4209e166a5ce025d93ae5515e85b1d41f1
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 10860 bytes
SHA-256: a2a82958293d58cd7359daf805751b357dab2a75af5d5a347a7ec48308291fe5
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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