Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7e7a7d3e583a68…

MALICIOUS

PDF

82.8 KB Created: 2021-03-23 11:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bc807a63f24c28ece0098ce171fdebb SHA-1: 502b4bb2b422a204fa4b0d388c8266a7cac04fde SHA-256: 9d7e7a7d3e583a686af55fa23911dc721359b18a0145c2b97d0abbb6e3410912
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=angles+in+a+straight+line+worksheet+answer+key+level+1
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5ff939beb3728.pdf
    • http://prizyivnik.ru/davis_drug_guide_app_login1hatv.pdf
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601bfe44770be.pdf
    • https://cdn-cms.f-static.net/uploads/4392218/normal_6058b8096a0a7.pdf
    • https://static.s123-cdn-static.com/uploads/4473645/normal_5fc583ac942da.pdf
    • http://shtangye.xyz/wojanorusabupugewixikjfpk.pdf
    • http://itravelgr.com/solution_survivor_zombie_outbreak5eia8.pdf
    • http://lofajemami.sportsontheweb.net/58618631497.pdf
    • http://lenusabipowezo.getenjoyment.net/14447333210.pdf
    • http://amandeepsadyora.com/positive_and_negative_number_line_worksheets95u6g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aca72ae0-5a33-4e4b-bcf7-ae3c4ae6b123/43472281389.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/diamond_aircraft_parts_manual.pdf
    • http://mabiwariw.epizy.com/docker_cheat_sheet.pdf
    • https://s3.amazonaws.com/wiwamoxamo/besame_mucho_guitar_tabs.pdf
    • https://s3.amazonaws.com/dojivewobasuval/2005_cadillac_cts_ecm_issues.pdf
    • https://s3.amazonaws.com/kegovev/diwaboviwaxe.pdf
    • https://uploads.strikinglycdn.com/files/27984502-a954-4884-b9c8-13c46b2ecd41/zaxaleketoxaresav.pdf
    • https://uploads.strikinglycdn.com/files/bce7ebf5-fc2c-4824-88a3-4d6ecaab12ce/84463684771.pdf
    • https://uploads.strikinglycdn.com/files/7ca9ccc9-227a-4ff5-968e-07197a4951f7/81995738168.pdf
    • https://uploads.strikinglycdn.com/files/3c02fa6f-6400-4e26-a315-ce7058c3adfa/raxevupitafojapolub.pdf
    • http://rarefovukafulu.rf.gd/what_battery_do_i_need_for_a_ford_focus_key_fob.pdf
    • http://dipijiz.epizy.com/how_much_do_hedge_fund_managers_make_in_india.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed84.bin
a0a34bad8afcad8c3403d8d6c00ac9380aa1988da0f99cb3414252ae8a2bf9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5304 bytes
font_01_sfnt_off0000ffaf.bin
3c9be45840438722f5d33493ab09ff22ef50baf88a70bfc4c4df7a92af831491		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 11748 bytes
font_02_sfnt_off00012804.bin
062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 16072 bytes

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