Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa4ec3fcceda4fc…

MALICIOUS

PDF

75.1 KB Created: 2021-04-04 04:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a6c8c433a8cf655234aa15cdf17f66fa SHA-1: 5971c1bba3c51679ac3b119a68c59d1e909e40eb SHA-256: 8aa4ec3fcceda4fcf5159741c39ba1325017b02da719fb29f7f0fcf2c0b06a85
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=length+times+width+times+height+worksheets PDF link annotation
    • https://cdn.sqhk.co/kagitenoru/gdhdhdW/50381166662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5fd147e69c475.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/qjfjfgj/zadebodazopotagokuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_60499c4d76a16.pdfIn PDF document text
    • http://lnstagramcentre.net/how_to_stop_chainsaw_from_leaking_oillv651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_6025aec1477f5.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/fhbfhat/panzer_platoon_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/bwkbKIO/drift_zone_locations_forza_horizon_4.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/j1hiTpj/chicken_manure_vs_cow_manure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_6054ab056ff47.pdfIn PDF document text
    • http://roflan.site/konosuba_light_novel_volume_1pb9hk.pdfIn PDF document text
    • http://trynon.xyz/20124887010hi1t3.pdfIn PDF document text
    • http://reestr.site/vk_publications_accountancy_class_11akco6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_6021022fdfbf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_5fe90bf29865f.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/hi9gfhf/tadaje.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/7haijaJ/iphone_theme_for_oneplus_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_a80f31e13d1743cf862906ad5663ece7.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_6f190e43612049dea94af2712f0d9d1c.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_e052172e68b046e893047c8622761d8c.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 5096 bytes
SHA-256: 9cff9e01c8e668660e0bd9372949a1b566a43307c4dbac4b69a0c5126f4db7ea
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 10488 bytes
SHA-256: c1dcee78e972bca5c3a066d31fbf3d77d544f7d1950c0b08ac61edc1057613a3

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