Malicious PDF — malware analysis report

Static analysis result for SHA-256 2771cb3d2cfe95fa…

MALICIOUS

PDF

74.0 KB Created: 2021-02-24 18:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f2ab8e46166f267ec99adef212fde68 SHA-1: dfc48066986954d05a32972981642b91136edd2a SHA-256: 2771cb3d2cfe95fa6a7b34c2c10bf9e1d3908d3f22acf4a6bef60c408751b2a8
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical redirector link and ML classification, indicating malicious intent. The embedded links and the document's structure suggest it functions as a link farm designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. The presence of numerous unknown reputation URLs reinforces this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+deal+with+time+management+in+college In PDF document text
    • https://cdn.sqhk.co/setinapas/hheJhho/blue_bottle_logo_meaning.pdfIn PDF document text
    • http://jopkapopka.online/college_football_summer_strength_and_conditioning_programpeaou.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/YEB1jjh/lizinefax.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/kibjcje/9138822250.pdfIn PDF document text
    • http://sewamagiz.66ghz.com/alberta_snow_goose_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/UZEA1jh/penn_state_ice_hockey_game_tonight.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/financial_analysis_report_structure.pdfIn PDF document text
    • http://tonobipuko.iblogger.org/kixabutabekavexu.pdfIn PDF document text
    • http://znatural.space/bissell_cleanview_carpet_cleaner_partsncedq.pdfIn PDF document text
    • http://zvezdasevera.online/buputobusagovemevoduxk794.pdfIn PDF document text
    • http://daating19.site/flight_simulator_2018_flywings_android_1af99t.pdfIn PDF document text
    • http://bullbananavannaone.xyz/xosamimosusuj3ntn5.pdfIn PDF document text
    • http://gupozatu.22web.org/17405656682.pdfIn PDF document text
    • http://lg-copyright.com/what_causes_a_car_to_run_rich_or_leanlbmu7.pdfIn PDF document text
    • http://usesol.xyz/crysis_3_crackesub2.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/gc1qgic/8d_music_player_pro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumosutu.rf.gd/how_to_update_fiio_x1_2nd_gen_firmware.pdfIn PDF document text
    • http://mofetase.rf.gd/inshore_fishing_guides_charleston_sc.pdfIn PDF document text
    • http://vabuperupijod.epizy.com/most_entertaining_person.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_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 5132 bytes
SHA-256: 3b63ebe541d3356eb8f0f3d811c22b2ddf073a861805b0247720e71a9b24f7ac
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 10112 bytes
SHA-256: 9f8e17bcb13a5ef517ef45b8793cfa6de75ce34c58708a10b8f26ad2a300948c

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