Malicious PDF — malware analysis report

Static analysis result for SHA-256 21683d4e29885e41…

MALICIOUS

PDF

76.5 KB Created: 2021-03-10 02:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 756dbe35fc0efe13868711a0030d6533 SHA-1: efadc410cd953248a491d9e1a6aaf1dad397eb9c SHA-256: 21683d4e29885e41e7d7e0c3d53b56ed7046af6556181e4f8589aa36b8723729
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The document body, though heavily obfuscated, suggests a theme related to 'Minecraft pe the island seed' and includes numerous external links, many hosted on disposable domains, indicating a link farm for distributing malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document directs users to install fake browser updates or extensions, a common tactic for credential theft or malware installation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/aws?utm_term=minecraft+pe+the+island+seed PDF link annotation
    • https://cdn.sqhk.co/zilidadakole/bhjKieo/gibaladilobewoxis.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/njcAhgi/86231951792.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/abstract_algebra_david_dummit.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hgfjjqA/water_physics_simulation_pro_package.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/jbfjjhh/star_wars_galaxy_in_turmoil_download.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/She5Uij/amc_two_factor_remote_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488092/normal_6028f01f90e05.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/13328540171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5fe010ed88b1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444648/normal_602ba01fc6a78.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/fire_and_ice_melrose_arch_food_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/giWhcje/swot_analysis_template_word_2007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417419/normal_6000324767ded.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/6khejio/25173864448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fd2e381d6075.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/what_shall_i_do_if_my_dog_bites_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_49aa01504af2448e849876786f508a49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebaxa/nobinuwadidadobil.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/silicone_gel_sheeting_for_scars.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/65166483288.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/today_s_word_jumble_answer.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_0aa05b4e86a549d4833765e9c3dfd2df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/landforms_in_australia_worksheets.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/33419305194.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5248 bytes
SHA-256: 4a31bd41736a335505ed2605eba12f4154a7b52ddd17098444106c44b2c0c2d2
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 10208 bytes
SHA-256: c57d8e70f47a8d780118e7f331e431f58435c8d6096f3c641d16cadf6b17202c

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