Malicious PDF — malware analysis report

Static analysis result for SHA-256 e819a5c3b4b7de60…

MALICIOUS

PDF

83.4 KB Created: 2021-04-07 02:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1987ffe414c820152d4f42717cec4304 SHA-1: 664a4dc44c8c35f25b810a4516657b2cf5277fa8 SHA-256: e819a5c3b4b7de6059a545ee8493073522d2fe3aa7e10708ba78ec69d110c95e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'lozipotod.ru', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though partially garbled, suggests a deceptive lure related to a 'Leadership style survey for students'. No scripts were extracted, but the presence of embedded URLs and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=leadership+style+survey+for+students
    • https://cdn-cms.f-static.net/uploads/4455876/normal_605247a6dcf16.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_604773a4499e9.pdf
    • http://support-copyrighthelpservice-about.com/jevemizipadikugokukanozfirc.pdf
    • http://sarepoxorak.22web.org/lebotezafuta.pdf
    • http://loveantravel.xyz/sims_4_update_november_2020_xbox_one9esxd.pdf
    • https://cdn-cms.f-static.net/uploads/4416654/normal_605d8733d7276.pdf
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5fc61a760fbe3.pdf
    • http://idealica-co.site/aviation_weather_services_study_guideqpxrt.pdf
    • http://vivabozuna.iblogger.org/hindustani_bhau_video.pdf
    • http://znakomstva18x.site/vifigenewinuxojogagoboyqdc2.pdf
    • http://persequenteamsohbet.com/columbia_flexible_capital_income_fund_fact_sheet7nv8o.pdf
    • https://cdn-cms.f-static.net/uploads/4455403/normal_6022c9ab96c83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3ea1bc27-4a94-4c48-ab34-c7f13e2d56b6/fovotadezevigofawos.pdf
    • https://uploads.strikinglycdn.com/files/2e664e27-184c-43ef-9f00-3013bb31b6ce/86677178527.pdf
    • https://uploads.strikinglycdn.com/files/7748dea8-e45c-4900-8b6d-547227772d72/how_to_make_answer_sheet_more_attractive.pdf
    • https://uploads.strikinglycdn.com/files/4e4baa7f-0171-4028-9f94-8c0c450a3941/wavosarap.pdf
    • https://uploads.strikinglycdn.com/files/ad91c9a3-d4e5-455a-a748-b2a30fa6b1ff/roland_micro_cube_bass_rx_amplifier.pdf
    • https://uploads.strikinglycdn.com/files/738dd4f6-219a-44d3-86bf-3fcdeba5c67a/a_feeling_for_the_organism_summary.pdf
    • https://uploads.strikinglycdn.com/files/eadb71ad-1fef-4e50-aff4-2678aeadaf4d/math_olympiad_contest_problems_for_elementary_and_middle_schools_by_george_lenchner.pdf
    • https://uploads.strikinglycdn.com/files/c48aacdc-0472-4ce3-9cc3-e0caba7bf471/vedajexuvuberuvivolesaz.pdf
    • https://uploads.strikinglycdn.com/files/914dbbbf-4af4-47a8-b47b-863676a9ae3d/lista_de_verbos_regulares_e_irregulares_em_ingles_com_pronuncia.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ca.bin
01e1f69e465a5d6ef3aa01cd8fcf8eff138806b52bd6326c0fde0e17042ce32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 5232 bytes
font_01_sfnt_off00011ba5.bin
f56d3f877b09ba3bd42fbb47afe40a08ac153fde98e8384238af3e7b8cac0c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 10692 bytes

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