Malicious PDF — malware analysis report

Static analysis result for SHA-256 4489379ea90b00c8…

MALICIOUS

PDF

80.9 KB Created: 2021-05-06 21:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9d94e67140e146d6c01f2da70de8705 SHA-1: 8ff6e170407050c41c2464596acdd402b08ad9c0 SHA-256: 4489379ea90b00c83ed7a0872c169449ee6547e888abee4e170fd1018f4b4586
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 0.9996

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://crophysi.ru/strik?utm_term=schwinn+airdyne+pro+console+manual PDF link annotation
    • http://fesotisifofil.mygamesonline.org/sales_manager_duties_and_responsibilities.pdfIn PDF document text
    • http://esclick.pro/barbarian_assault_defender_guide_osrsnz9j5.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/brighton_rock_novel.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/wesijatug.pdfIn PDF document text
    • http://pek-24.cc/85172386158lv1w9.pdfIn PDF document text
    • http://hyipinvest.site/how_to_do_origami_easyvwcjx.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/7Bnhfgh/pokemon_home_ios_app_store.pdfIn PDF document text
    • http://pocki.top/womasuluvul745hl.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/latafivefukijapew.pdfIn PDF document text
    • http://tuimag.ru/c_d_m_a_full_formpzpla.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/dSggF7w/ruwamotilerosota.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/structural_family_therapy_techniques.pdfIn PDF document text
    • http://wujasonuvilo.mywebcommunity.org/cash_flow_statement_ncert.pdfIn PDF document text
    • http://giviwopifa.22web.org/what_are_the_un_sustainable_development_goals.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/mibiwivanetuj/13754099535.pdfIn PDF document text
    • http://tizanuzija.epizy.com/jajomunutelotasu.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/95411837049.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/63887749364.pdfIn PDF document text
    • http://nolagevupuxuje.epizy.com/35065824759.pdfIn PDF document text
    • http://dikaroko.rf.gd/2484776289.pdfIn PDF document text
    • http://vatasinunevuto.epizy.com/excel_header_and_footer_all_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/63679701186.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_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 5608 bytes
SHA-256: bb6adef54adc177ecb0c4056477636a148e158547392e704d0e7dfebea6eb753
font_01_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 11300 bytes
SHA-256: d14e92e0e6ba8a93aa2f3a7b406c45237b56c31160fbe1480562e992969bb2f7