Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd546926bd3ea91b…

MALICIOUS

PDF

75.1 KB Created: 2021-03-22 22:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c8ebf0f3f7e9a7c47d3ddc1069b9bcf6 SHA-1: 217c8218e44e1174ac3461bdd9b401bf2255ed87 SHA-256: bd546926bd3ea91b75acfc7ccb1ef0167931fbf2eaf0f90b85fcdd6ade843abd
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm designed to host numerous external PDF files. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests a pretext for users to install or connect to remote support tools, which is a high-risk activity in unsolicited documents. The presence of multiple external URLs, including those on disposable hosting, indicates an attempt to distribute malicious content or redirect users to phishing sites, likely facilitating the download and execution of a second-stage payload.

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
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://resalured.ru/123?utm_term=answering+service+software+free PDF link annotation
    • https://cdn.sqhk.co/kozuvurop/2nyiAii/edjing_mix_dj_music_mixer_free_download.pdfIn PDF document text
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/6446899.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/f00Ciaj/sniper_strike_special_ops_hack_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/f0Oxejb/prank_sound_effect.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/avivamento_adorao_central.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/sansa_clip_zip_replace_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/8UAjfNa/76684210201.pdfIn PDF document text
    • https://dugaxopi.weebly.com/uploads/1/3/5/3/135305828/0acf53a.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/eIRijje/kavexafidowuforefu.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/hijjifJ/voice_access_app_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/ZjfxNMi/sujiw.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/toshiba_ct-90325_tv_bluetooth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lilorubetu.epizy.com/woninumereruwiwijatimir.pdfIn PDF document text
    • http://seretavezoduriz.onlinewebshop.net/patterns_of_enterprise_application_architecture_free.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/why_is_my_router_internet_light_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdefee8-1c95-45bd-b54b-883631ba3142/how_do_you_program_a_chamberlain_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3070905d-cde9-47d7-a837-309f4216c262/asian_stock_market_opening_time_in_india.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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5160 bytes
SHA-256: a97dbde9e5a492f2e4791b5b01f5807560cb1456551e5ae64ad9e6f2cbe27b57
font_01_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 10788 bytes
SHA-256: fc747b4fe80376f2e9eeeb4d50f5a4bf121aa5faa446400b3c92180d606620fe