Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbae2975edfce161…

MALICIOUS

PDF

77.3 KB Created: 2021-05-03 22:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 24daedc0d397e2efee0041e40d4a511d SHA-1: d7c2398d5e760925ff532597ee2f11c9a95a6477 SHA-256: fbae2975edfce161ce8656a12b88db1b3425c2facf4211a26b8e69e3a60a9443
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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what%2527s+mla+formatting PDF link annotation
    • http://wumewil.sportsontheweb.net/sixth_grade_math_workbook.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/30248423712.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/vebaka-kezuxuwusotim.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/nulel.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/parotaxunugudixivadekoja.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/materiales_no_metalicos_organicos_e_inorganicos.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/biblia_satanica_romana.pdfIn PDF document text
    • http://doorstepcomputers.com/zifefenogulezowobyasr1.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/glencoe_mcgraw_hill_algebra_2_online_textbook.pdfIn PDF document text
    • http://levantemosaic.com/how_to_setup_brother_printer_to_print_wirelesslycdll0.pdfIn PDF document text
    • http://jsexj.fun/fabfitfun_winter_2020_add_onsyshe2.pdfIn PDF document text
    • http://xuforaxi.22web.org/clanbook_tremere.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/2020_honda_rebel_500_abs_price.pdfIn PDF document text
    • http://whitetwo.space/94851014120khgcx.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/kejenatifowebisoruze.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/rapagafoxudev.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/6e3c895ae6a7c6.pdfIn PDF document text
    • http://kprovk.xyz/decimals_worksheets_for_grade_59kr39.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/free_forklift_certificate_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://julizut.rf.gd/82043517320.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/are_all_graco_snugride_bases_compatible.pdfIn PDF document text
    • http://rokijer.epizy.com/administrative_law_book_free_download.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/linear_sequences_worksheet.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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 5228 bytes
SHA-256: 6660b369e5e9e02123b6fd7784469bea16415b2f1d64324a9075ce101038a2d0
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 10968 bytes
SHA-256: a5b9540c6af9ce10faa4843494830abb52d6b3eb09f25690404995a1b5432a7f