Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7b3e0fc7640a68…

MALICIOUS

PDF

65.7 KB Created: 2021-02-25 23:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 66846386245550416b00b02a1e035126 SHA-1: af5da401ca9b58f40a4bfbea834762f0eb276a66 SHA-256: 2f7b3e0fc7640a68c5752f1333d56a5833fa728274d6ae022501ca6479c5d941
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=nomadic%20furniture%203.0%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368229/normal_600758c176218.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/tascam_recorder_review.pdfIn PDF document text
    • http://nasaxupinile.iblogger.org/what_episode_do_kaneki_and_touka_kiss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fc8faa233e8a.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/ejemplos_de_dialogos_en_ingles_traducidos_en_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_600ae6e82a04c.pdfIn PDF document text
    • http://ig-copyrightnotice.com/4489173107895j3y.pdfIn PDF document text
    • http://vk-settings-change.online/historia_de_la_contabilidad_librod375h.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/7563057283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2e00be647.pdfIn PDF document text
    • http://weareanonymous.org/one_plus_one_abc_tv_guideahkou.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/nufemugagisuxizjobv.pdfIn PDF document text
    • http://daliadiago.com/buruvenq66oq.pdfIn PDF document text
    • http://save50it.pro/ncees_pe_datespwxps.pdfIn PDF document text
    • http://housefashion.ru/atomic_structure_and_nuclear_chemistry_worksheet_answers0d0du.pdfIn PDF document text
    • http://ptmonline.ru/pwm_solar_charge_controller_manuala5kp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_602a0250c18b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soxalisaxofaba.epizy.com/cfx_solver_modeling_guide.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/manuale_arduino_starter_kit_italiano.pdfIn PDF document text
    • http://litopuputorer.rf.gd/free_vpn_android_china_server.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_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 5400 bytes
SHA-256: 29d3a0540a2a43c3c68354599dc93e8490649745e9daa9d6b402700a727dd0a8
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 10104 bytes
SHA-256: 03ce435ebde6b60e1cde1e910b71904f35a22775b84be2baf68f04c27a406ec3

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