Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4395c2824d2c03…

MALICIOUS

PDF

71.5 KB Created: 2021-03-14 16:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88f5f916229c96e0072636615d734009 SHA-1: 52d147b9c02e549cbee46bc173f3182c868508df SHA-256: 6e4395c2824d2c03aef3e38927742c698a802509accc56f4146600989dfaaeca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/award?keyword=direito+penal+bitencourt+pdf PDF link annotation
    • http://usechambre.xyz/64701399049frjl9.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/muwekemonaxexofubumawik.pdfIn PDF document text
    • http://harmony-market.ru/worx_aerocart_user_manualjj7yo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadarawofi.epizy.com/ley_general_de_titulos_y_operaciones_de_credito_comentada.pdfIn PDF document text
    • http://juletonos.epizy.com/dubuzaxuwogefun.pdfIn PDF document text
    • http://tiwojojerat.rf.gd/employee_agreement_form_template.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_0280468364ad4ceb8aae27f1da7b3bd3.pdf?index=trueIn PDF document text
    • http://vekemelegewimo.atwebpages.com/farobi.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/40939820587.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/acoustimass_10_series_iv_price.pdfIn PDF document text
    • http://nanesipub.rf.gd/saddlebag_lake_ca_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f285612f-21f3-4f5e-baf8-0f969d206bda/lazy_boy_recliner_repair_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6892eda-b76b-484e-8b5d-2711da162d1d/how_to_start_trading_bitcoin_for_beginners.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_5aac28454bc9414ea316f219fb8218e9.pdf?index=trueIn PDF document text
    • http://nekaluro.rf.gd/flamingo_park_racing_form_guide.pdfIn PDF document text
    • http://bidadaweba.epizy.com/nisirufiputafoluweju.pdfIn PDF document text
    • http://bixixus.epizy.com/nikixegixeta.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_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 5112 bytes
SHA-256: 20d5cf2fa1b9de29fc4e17a70c4e5c6de916f4bdaffbe7dea8956bf12a66fe58
font_01_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 13744 bytes
SHA-256: 6b2a31576abd1286620e982d9815b53d861f74fb4e84c794a789c41975bc6937