Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d0bfec3b68efef…

MALICIOUS

PDF

86.2 KB Created: 2021-04-19 09:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2f167fea9101247be1d79e39caa4bc23 SHA-1: 8a22988a15fb894258fc4882c5287df28db2d5f8 SHA-256: 55d0bfec3b68efefb395f14554c643a9827dd5fc9dde25e309cba8b1a2e0d3e8
186 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. 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 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://druttle.ru/strik?utm_term=how+to+write+fifteen+thousand+in+numbers PDF link annotation
    • https://cdn.sqhk.co/vafodagusun/ihM9if0/amino_undertale_espanol_para_pc_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/pXoxge7/31396812255.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/4472412.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/f9quheQ/buxuzalamab.pdfIn PDF document text
    • http://wonujabazuvopa.22web.org/nibolajamadononujik.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/goboguzazomisa.pdfIn PDF document text
    • https://dixetomik.weebly.com/uploads/1/3/4/7/134775969/netulufedape_pifulewunoxo_saxes_zamitimofi.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/jdjg5jj/bukitidizinojomevogu.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/norumoxijizov.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/attestation_de_changement_de_domicile.pdfIn PDF document text
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/daeb673dc6b0.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/a8a5982d1e67f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_6022877fa1ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_602aa4a7585de.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/ig4mR8n/mobile_phone_screen_recorder_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xevijojikutep.onlinewebshop.net/bsc_math_syllabus_download.pdfIn PDF document text
    • http://rowezezivifa.epizy.com/air_pollution_details.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/acceptance_test_plan.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 5308 bytes
SHA-256: 20c02bcbba7099d03b96f093bdc1a25014a3d3cc99aad2d2490224aac54015a4
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 12192 bytes
SHA-256: 19196e4fa0afb4f2a54f1ee584688294d105ac44958c164cdb03c252beb7a4cf
font_03_sfnt_off000135f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F7 16172 bytes
SHA-256: 7a5f68eba517fe73a39a507f87ef3723e064e7a6f7545ed5a62ab8365148c8e4

Open this report in the interactive analyzer, or submit your own file for analysis.