Malicious PDF — malware analysis report

Static analysis result for SHA-256 6868161e4aed2834…

MALICIOUS

PDF

76.4 KB Created: 2021-03-10 17:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4cfab968d54c221b4fd10f4bbc571445 SHA-1: bd20136a454d183ed01eb546fb724ad297b7b30a SHA-256: 6868161e4aed283499c6d8c72d23bd6aafab720990f94149fbb119ad41c7e403
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many disposable domains.

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://baarspo.ru/wix?keyword=biology+the+dynamics+of+life+crossword+puzzle+answers+key+mcgraw+hill PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390999/normal_602f1db010f49.pdfIn PDF document text
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/zatudinefakave-mugiw-jejamevetapa.pdfIn PDF document text
    • http://simultaneously.space/organizational_behavior_and_human_resource_management2mn5i.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_to_connect_polk_audio_soundbar_to_subwoofer.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/7018721.pdfIn PDF document text
    • http://skidki-day.site/pako_car_chase_simulator_ios_freehnj9e.pdfIn PDF document text
    • http://trokot-shtorki.online/what_are_the_easiest_songs_to_learn_on_ukuleleb39da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407782/normal_6007ec3d25fcb.pdfIn PDF document text
    • http://dress-russia.ru/run_race_3d_download_uptodown7t6cn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_602ce6d5db7c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_600fbece8cf85.pdfIn PDF document text
    • http://sabofogetazo.22web.org/fukimegixomefifupurarut.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/zejekifuno_pezuselejulum.pdfIn PDF document text
    • http://bella24.xyz/45828053078t5wcm.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/zigonevadetizuladexuxeto7s24.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/gawujilijeluvivitimobuzl2mq1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416494/normal_5ff5b78329320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zavipazo.epizy.com/76241802585.pdfIn PDF document text
    • http://moliwofasekimu.epizy.com/31083484078.pdfIn PDF document text
    • http://komomikadexep.rf.gd/hotel_room_booking_excel_sheet.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/rujalajulabesezet.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5924 bytes
SHA-256: 55ae3ece8e64cfd21903d7fa4ef7449410f690f84268f685b08b32ad19493537
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10072 bytes
SHA-256: da9c91dc1cd33a7f69e9f2cceb2101bc1c5a50562773a966876a9149f70340a1

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