Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3f5478d0acb7eb…

MALICIOUS

PDF

70.8 KB Created: 2021-03-09 09:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1078a5c2f6898615e4adf63f9fabaa61 SHA-1: dee7885ad7367092330bf9f9cd7bc9da203f5345 SHA-256: ea3f5478d0acb7eb98fc36a159b4bd8f36a4baf3d3a97e4b4454d2db425acb64
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('dafemum.ru') that is likely used for command and control or further payload delivery. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=speak+your+mind+in+writing+c2+pdf PDF link annotation
    • http://gugudavi.22web.org/used_yamaha_dirt_bikes_for_sale_125cc.pdfIn PDF document text
    • http://bullbananavannaone.xyz/impact_of_demographic_factors_on_businessq3hxj.pdfIn PDF document text
    • http://misstourist.info/26576743944u28aj.pdfIn PDF document text
    • http://robot3.site/how_to_print_excel_worksheet_with_gridlinesk4dtf.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/whirlpool_front_loader_washing_machine_parts.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/61712978975.pdfIn PDF document text
    • http://savadaqwe.space/70651483514i94he.pdfIn PDF document text
    • http://prodson.space/guidecraft_folding_desk_organizervkcde.pdfIn PDF document text
    • http://copyrighthelp.info/vifizaxozrzxyu.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/alcatel_one_touch_charger_specs.pdfIn PDF document text
    • http://on-arenas.com/charge_2_not_syncing_sleepic35g.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/local_homeless_shelters_that_accept_clothing_donations.pdfIn PDF document text
    • http://bukogibewidigu.iblogger.org/berserk_manga_deluxe_edition_volume_3.pdfIn PDF document text
    • http://animoney.xyz/datesakuzat0amd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizomepikoxi.epizy.com/lavaramevewoxusil.pdfIn PDF document text
    • http://donarup.rf.gd/tabla_periodica_de_los_elementos_para_imprimir_en_blanco_y_negro.pdfIn PDF document text
    • http://jodetiwozefiso.epizy.com/xewurugugub.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/comparative_advantage_and_trade_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/yamaha_cygnus_x_125_service_manual.pdfIn PDF document text
    • http://rixumigeva.epizy.com/sunikanijinarigivi.pdfIn PDF document text
    • http://tidegofavinugaw.epizy.com/41822729221.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/ikea_australia_catalogue.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_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 5760 bytes
SHA-256: 1aa7131161eb1da09a1c4fcec19e378412f17692a8cadd46d84a341df8b39e7b
font_01_sfnt_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 14776 bytes
SHA-256: 5ac957d3b95918040b769bfd5b49d72106fcad526671e0626b20a507d11fd1d5

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