Malicious PDF — malware analysis report

Static analysis result for SHA-256 889ac0424f89acdd…

MALICIOUS

PDF

75.1 KB Created: 2021-03-28 04:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9acfd5c20c68006e178ab86b9f769451 SHA-1: 7532a7deb65bae9c203fbbaaa9d898e80f627b61 SHA-256: 889ac0424f89acdd2f64748959e050648866fd9898bdc67e53be4a1721ed758d
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The embedded URL, https://seumenha.ru/strik?utm_term=prefixes+and+suffixes+practice+worksheets, strongly suggests a phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a common phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=prefixes+and+suffixes+practice+worksheets
    • http://repetitor-ru.ru/25259822932sptlj.pdf
    • https://cdn.sqhk.co/poronujefino/Wjejacv/alita_battle_angel_2_movie_trailer.pdf
    • http://grigolia-studio.ru/are_ford_maintenance_plans_worth_ity11dh.pdf
    • https://cdn.sqhk.co/vopofuxo/gOyoXRE/belfast_city_airport_wiki.pdf
    • http://likelid.xyz/bitcoin_mining_server_apkhnvah.pdf
    • https://cdn.sqhk.co/sadudolamom/jeShhqM/boba_tea_near_me_open_tomorrow.pdf
    • https://cdn.sqhk.co/migefareg/dqigwjb/31283455549.pdf
    • https://cdn.sqhk.co/kupawusel/7wFxjbw/auto_photo_background_changer_app.pdf
    • http://help-feedback-amzn8.xyz/vygotsky_cognitive_development_theory_summaryk5kry.pdf
    • https://cdn.sqhk.co/fabunavaxa/bF0Ljiw/free_fonts_for_cricut_dafont.pdf
    • http://atomyimperial.ru/sarosupllpzd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fe319a67-7fe8-4df7-832d-7bd0f0fc3f23/can_you_put_vicks_in_your_oil_diffuser.pdf
    • https://uploads.strikinglycdn.com/files/9adc15e3-141b-4212-aed2-de3d1547cdad/noladupa.pdf
    • http://titugol.atwebpages.com/vunevimusenosi.pdf
    • https://uploads.strikinglycdn.com/files/a7946d73-0778-4a6c-86b3-04ecf9a87dcb/which_is_better_honda_civic_ex_or_lx.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_efbecdb3f78e4743a5daef9fdbf20e96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6be45257-0b59-44e8-9809-315b6936ca65/83965510102.pdf
    • http://sogivuwe.onlinewebshop.net/fozuw.pdf
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_c2a8258c3075446484ce36ff2f6cedd9.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_0d054c02f103434cbdf07526f292de82.pdf?index=true
    • 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_off0000e848.bin
ae130f507dd4a32bb73f39822d210e91682478a1034c7c7fd6d3483b7545f7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 5436 bytes
font_01_sfnt_off0000fada.bin
38bc547962932f6f0c45437d6a26fe42bc43683e131a27a0435f1af86cbd9b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 10632 bytes

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