Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee23d0086626c00c…

MALICIOUS

PDF

77.1 KB Created: 2021-05-05 13:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b761d25da24094aab4cff2b46048daf SHA-1: d680820f83a8406511e77b83d70b9c799cf8afea SHA-256: ee23d0086626c00c810de415b985139cb836b03aff4e7f370ec1f41625161513
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, indicating a link farm designed to drive traffic or potentially distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or traffic-driving campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=cuisinart+12-cup+coffee+maker+%2526+single-serve+brewer+black
    • https://cdn.sqhk.co/kakolutezegu/hbjfihk/33442124530.pdf
    • http://dufazesiz.mywebcommunity.org/houghton_mifflin_harcourt_collections_grade_7.pdf
    • https://cdn.sqhk.co/nupegefozub/jdifnjb/quantitative_risk_analysis_techniques_in_project_management.pdf
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/lasalikitiboloruru.pdf
    • https://cdn.sqhk.co/sidogorego/ceqXJgc/97549032238.pdf
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/japulikafogoz_pamakowaloleda.pdf
    • http://difozoxezepi.getenjoyment.net/metric_mania_lesson_1_length_lab_answer_key.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suxuzubojut/27070107475.pdf
    • https://s3.amazonaws.com/satuja/gexozadixakudigom.pdf
    • https://s3.amazonaws.com/pajeriramal/domino_pizza_australia_annual_report.pdf
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_f2190a82020843dd826550b6a25993d2.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_326a69d66be04de7833039e3791f09e4.pdf?index=true
    • https://s3.amazonaws.com/sifawekujiki/87512607628.pdf
    • https://s3.amazonaws.com/zatazewoz/bewars_ringtones_telugu_ing.pdf
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_92797ea80e0945e1af6629e523fd3f9e.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_59a980417b67402d8b6a507548a9ab16.pdf?index=true
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_21a78eec54c143da82dcd4c34ec69dd8.pdf?index=true
    • http://pusapovewazigu.onlinewebshop.net/kemapaf.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/universal_crossword_answers_june_25_2018.pdf
    • https://s3.amazonaws.com/nuselufuzo/wondershare_mirrorgo_for_laptop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8c.bin
59b320c2929152b699b1e1bbd0793cd840f7127d644fddc92fa8b3c38e6561f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 5316 bytes
font_01_sfnt_off0000ff98.bin
286a68b0fe3fb30242ec5a46a25dbb98f2e28daf793b66966051181505b73124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 11056 bytes

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