Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aef65b8aa276a7…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 20:28:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4d10ce0d714c6f8a719f290764074c3 SHA-1: 5bb577b4b2d394f83d897660a446bed9c8a4ec10 SHA-256: 23aef65b8aa276a7a0e556042a0945b0ff1337b8ec70d59c5ca2bf496654dcc3
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 0.9999

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://soxebez.ru/strik?utm_term=why+s+corp+is+better+than+llc PDF link annotation
    • http://xitabijasava.getenjoyment.net/how_to_use_telescope_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/DLhfpx7/33345256054.pdfIn PDF document text
    • https://mifopubulu.weebly.com/uploads/1/3/1/6/131637027/joxogogerudi.pdfIn PDF document text
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/salajizezop_zosunituvove_suxogivilab_fetetiraxi.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/dusudimam.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/padma_vibhushan_award_winners_list.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/hacgjhi/numojelanowatej.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/ganuselevofaset.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/HihIV0D/bread_milk_grocery_shopping_list_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/hgfRL4V/rizenujezodegarab.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/69085060603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwoxidewoje.epizy.com/92226697803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9f5f10-cf20-492d-a7f0-96164fd9cf66/basic_power_electronics_mcq.pdfIn PDF document text
    • http://dululelafekupas.rf.gd/how_to_get_a_job_at_gamestop.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/autel_maxiscan_ms309_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c63772-9dc8-4ebf-829c-0ee9ada4e0d5/marketing_coordinator_salary_indianapolis.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/lefomodoxun.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/icom_ic-v8000_service_manual.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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 5276 bytes
SHA-256: 1c1b89e9dc4fcba8a32f60fa0e9018e8ca745503f14c953d6a9dbfee7abfdaca
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10660 bytes
SHA-256: 7138166bf7773867e76099a5723cd048e978de385925380bce40435ce5fa56b1