Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3a5166fc099b37…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 12:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 02a8e28a86e60863c90ee43e80908742 SHA-1: e2968199523f9635603ce46521cddd099ebf26b5 SHA-256: ef3a5166fc099b37c75a4dea69ebd2fa315811bda2903ec7902c7e221b07454d
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various disposable domains, one of which is a deceptive URL for a supposed software download. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading further malicious content, likely through a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=1-3-1+zone+defense PDF link annotation
    • http://boevoenlp.com/bus_simulator_original_2015_download9n54j.pdfIn PDF document text
    • https://cdn.sqhk.co/namemedoxake/IohdNii/regulomi.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/upper_limb_anatomy_important_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/c1lEhiU/rosebibisokinojedu.pdfIn PDF document text
    • https://cdn.sqhk.co/fojilude/at0ibgg/nascar_go_karts_pigeon_forge_coupons.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/flysky_fs_i6_2.4_g_6ch_afhds_rc_transmitter_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/bG54X0M/96385872479.pdfIn PDF document text
    • http://domapekoti.22web.org/91038235574.pdfIn PDF document text
    • https://cdn.sqhk.co/wikikifigas/nVUDdco/converting_between_radical_and_exponential_form_worksheet.pdfIn PDF document text
    • http://evilcheats.fun/cognos_view_report_output_versionslxtrd.pdfIn PDF document text
    • http://upgrade4me.com/kuxalobiduwuf6bwyd.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/fBihdus/popurig.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/jarekikizanejelulibib.pdfIn PDF document text
    • https://cdn.sqhk.co/donewipimep/hh3jgiC/descargar_los_sims_mobile_hack_apk_ios.pdfIn PDF document text
    • http://prechambre.xyz/rcm_music_bhojpuri_video_mp4_hd4acwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/15383263510.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/the_odyssey_penguin.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/97761480896.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/washington_state_department_of_health_covid-19_dashboard.pdfIn PDF document text
    • http://vefovax.rf.gd/92237994798.pdfIn PDF document text
    • http://likijanima.epizy.com/almacenes_si_en_cali_uniformes.pdfIn PDF document text
    • http://jegudorutomowur.epizy.com/whatsapp_karna_hai_abhi_isi_waqt.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/consumer_reports_vacuum_canister.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_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 4768 bytes
SHA-256: 977b04954fd284ad6c25712914bbb57528c07a82cf1a726e4e6d6b33e8c8c04d
font_01_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 11696 bytes
SHA-256: 5be056161e04e77caf9731e96cebceaeeb495d61b2d2e75f4c8c457faaef6a8e

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