Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d687516ad29e98…

MALICIOUS

PDF

89.2 KB Created: 2021-02-22 23:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dc7743a83a11368e5f1e8678fd82b76d SHA-1: 4210e97781c6640b38517b26deb1abac25fa3862 SHA-256: d9d687516ad29e983e50e73e78b05c327cb7131651932d58fee642add1017951
66 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains numerous external links, many pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'economics gdp worksheet answers', indicating a phishing attempt to direct users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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/wix?keyword=economics+gdp+worksheet+answers PDF link annotation
    • http://dle-tpl.site/extreme_landings_apk_modjbmwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_602dcabc6fb2c.pdfIn PDF document text
    • http://centerverifybadge.com/viwixxlxnj.pdfIn PDF document text
    • http://copyrightprivacy.site/91842408545t735s.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/OjfhiYj/79546532914.pdfIn PDF document text
    • http://bigchance.pw/24427461564ii7uy.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/chfiftE/learn_spanish_free_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_600f3d2352eab.pdfIn PDF document text
    • http://lnstagramsecurity.net/higher_order_thinking_questions_for_guided_readingcdzx1.pdfIn PDF document text
    • http://reduslim-buy.site/fufupugatofa4fq.pdfIn PDF document text
    • http://govnososal.xyz/2008_dodge_avenger_battery_replacementr1tba.pdfIn PDF document text
    • http://lovemecompletely.com/wood_mizer_lt_40_service_manualp2z61.pdfIn PDF document text
    • http://snegny.com/109192686369r879.pdfIn PDF document text
    • http://reduslim-shopofficial.site/692865709585yecc.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/icjg7id/stormfall_rise_of_balur_champion_guide.pdfIn PDF document text
    • http://new-leggins.site/vtech_manager_herunterladenbrlsh.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoselubiki/0mSsPVD/donisokivufamowunemi.pdfIn PDF document text
    • http://lovemecompletely.com/disovarawavevopazufumakitt55tv.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/gafedupeba/jazokani.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/multiple_regression_analysis_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/16120320642.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 5568 bytes
SHA-256: f623830ea7b1256bc8f078c1aef6de0ba5f1ec200441073f24f9a1af5c19d4c9
font_02_sfnt_off00013216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 10240 bytes
SHA-256: c1f7cb1043102a17f1c0c0f82283fe3c934d8d03de1225fec4316ec1738792d6

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