Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb47a7c745b7677…

MALICIOUS

PDF

82.2 KB Created: 2021-02-24 14:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 619573c5f53f7fcb50333a4383b54c6e SHA-1: 9449e6242f28b1e5252cc4b9030128fe8e081bf8 SHA-256: 7eb47a7c745b7677ea8e90b52f8af73a65ede4435cf692182e7facbaaf983eef
166 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically using a "Windows 10 update" message to trick users into installing malicious browser extensions or updates. The presence of numerous external URIs, many hosted on disposable domains, further supports this phishing attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://leonvi.ru/award?keyword=windows+10+update+no+operating+system+found PDF link annotation
    • https://cdn.sqhk.co/sejixikerut/WRmxQke/8453590598.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/gfpFECQ/notes_payable_journal_entry_debit_or_credit.pdfIn PDF document text
    • http://air-calm2.club/dibujo_tecnico_examenes_de_selectividad_tomo_2c4i7b.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/hgjeNjj/vixurasofomiveloxopido.pdfIn PDF document text
    • http://groby-ritual.online/flight_pilot_simulator_3d_mod_unlimited_moneylszoc.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/mgcijat/lep_s_world_3_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_6031877bbfb1d.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/pPgeMhb/ouverture_frontiere_europe_turquie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368999/normal_5fe3dbe1b25a4.pdfIn PDF document text
    • http://creditactive.info/mid_module_assessment_task_answersbor1p.pdfIn PDF document text
    • http://instapresent.site/ladekevy46dc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/jgeiigj/business_strategy_game_quiz_2_answers_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nevawanipo/XJgfifn/kiveluvuxonagipebupolokil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384045/normal_60005155c2b6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/chevy_blazer_review_consumer_reports.pdfIn PDF document text
    • http://gakenefux.rf.gd/pazuki.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/android_x86_iso_marshmallow.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/borland_pascal_7_insider.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/90493776954.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/cartoon_hd_video_songs_free.pdfIn PDF document text
    • http://sinamalamukin.epizy.com/physics_igcse_answer_key.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_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 5732 bytes
SHA-256: 5c8e53779c65f57e7bd7d2b088e75bda397c3d34cb7b16be75c76d1ab1ad3f1f
font_01_sfnt_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 10524 bytes
SHA-256: 28df2f10476423006f657c8f6df01c965d372a9bf9fe03f21776cf63477eb0f1

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