Malicious PDF — malware analysis report

Static analysis result for SHA-256 817d9263799f8ad6…

MALICIOUS

PDF

72.3 KB Created: 2021-04-15 22:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b50b4924044ed4173a16152db156d695 SHA-1: 4640a67ffea31d36c4ddff371e8ed7b3761f473f SHA-256: 817d9263799f8ad6bd0fec8b6c3762edffc590c1ca315aa38d7677468c0995c6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation, but the primary malicious activity is inferred from the external links and the high-risk heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=uso+de+gramatica+espanola+elemental+pdf PDF link annotation
    • https://cdn.sqhk.co/dedizozife/hAAjgjc/zusorif.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/deserafifebusatemovidame.pdfIn PDF document text
    • http://flowerport.shop/marvel_comic_universe_movies_chronological_orderht7gb.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdfIn PDF document text
    • http://polnews.xyz/head_first_android_development_2nd_edition_free_downloadovk7s.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/c95hhif/download_win_x_launcher_no_ads.pdfIn PDF document text
    • http://samemere.mygamesonline.org/ballast_water_system.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/hgjiXgd/kavopezodogotirajozaz.pdfIn PDF document text
    • https://cdn.sqhk.co/saxamabewido/gzgfifQ/91195921103.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/diehcaw/66738734140.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/fjhhbjf/23713866476.pdfIn PDF document text
    • http://zarabatyivat.ru/82314447311rsjkw.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/advanced_algebra_worksheets_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tizexazebubo.atwebpages.com/felesunomimesemeluwokar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ade846-dbf6-4172-bdc8-6d08c16a936c/oster_bread_maker_5838_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/24156528408.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/print_police_report_chicago.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/buderus_logamatic_rc310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd081785-faed-4fbc-a094-122aeafc9966/miveratazoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce469b93-f7a9-4f0a-9b74-e003f42e78d3/how_to_get_data_analysis_toolpak_in_excel_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5182085b-0af3-4846-9d83-461017b9a6a4/55462652388.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_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 5468 bytes
SHA-256: 36309097f577b5e0c4a7d15b1317a0dc7ce199fb6019710f9f15105916d22caf
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 14772 bytes
SHA-256: d1ec2339b29bb0420a996437f2a7827e4af20ee4b55c8d9c2fea3b9095e6b31c

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