Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c2754004c6753f…

MALICIOUS

PDF

69.2 KB Created: 2021-03-27 17:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 327e20b5f8a55ac8bd1a82dc7456afbb SHA-1: 571fabf35f43bc16f848b708d534a8b1c0b30206 SHA-256: 18c2754004c6753f616efdb4e27fe6593b5ad2dfb77483c90c5bec4a6fe95786
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting it's part of a link farm or SEO spam operation. The embedded URLs point to various PDF documents, likely intended to redirect users to malicious sites or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=marengo+park+district+hours
    • https://cdn.sqhk.co/majumoros/hczihgg/quran_in_english_and_arabic_online.pdf
    • http://tomolijoponix.mypressonline.com/adobe_photoshop_tutorials_for_beginners_2019.pdf
    • http://munasimowijuxi.getenjoyment.net/48347580971.pdf
    • https://cdn-cms.f-static.net/uploads/4486197/normal_6042208ce0ee2.pdf
    • https://cdn-cms.f-static.net/uploads/4384143/normal_60446e858f212.pdf
    • https://cdn.sqhk.co/dubagojovo/4pk0hj5/61588699704.pdf
    • https://cdn.sqhk.co/lopijikuvi/gnijr6t/free_online_3d_shooting_games_multiplayer_no_download.pdf
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/97ea0c.pdf
    • https://cdn.sqhk.co/depadukat/gj7tjdl/mojodazobaru.pdf
    • http://visumetanopigi.iblogger.org/harley_softail_service_schedule.pdf
    • http://zesegalos.scienceontheweb.net/beauty_and_the_beast_partitura.pdf
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/bukudetolej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_f155a4366e9f465ca7f2c659117dfc9e.pdf?index=true
    • http://kamabutexukawiv.rf.gd/bahubali_2_telugu_movie_hd_tamilrockers.pdf
    • http://vigexosav.myartsonline.com/98555444053.pdf
    • http://sarirepenibe.epizy.com/xisimupegovixobisuza.pdf
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_788d6335093a459fa6469767d8125fa6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28e.bin
8ac6ec7be3902da6e18f3005be21536758a18f250bcdd4cd405c9ebee8981f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 5372 bytes
font_01_sfnt_off0000e4dd.bin
f8e2501cc7b4f30d2e7b10204924bdc06404955d906e69cc899e0604a689edb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 10336 bytes

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