Malicious PDF — malware analysis report

Static analysis result for SHA-256 6521d3b89992273b…

MALICIOUS

PDF

83.5 KB Created: 2021-04-03 00:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b0db00ca9364dbece7deafe4a38404c SHA-1: 48e45c69b6c2383204d925cb096ce7d31f9da36e SHA-256: 6521d3b89992273b08b895050d5b043ee51561f7347a2b832135a43c154bc3b4
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=what+is+the+best+rated+inflatable+hot+tub In PDF document text
    • https://cdn.sqhk.co/lesasafo/NiisrOC/kefefobubogiduzodisavo.pdfIn PDF document text
    • http://gekenig.mywebcommunity.org/wumeral.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/jjggshb/minecraft_pocket_edition_pc_download_tlauncher.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/function_transformations_worksheet_algebra_2.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/gghcXEV/99766335947.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/ijdN4je/airplane_mode_android_cell_phone.pdfIn PDF document text
    • http://gerda-msk.ru/rilifukugadonemidwmib3.pdfIn PDF document text
    • https://cdn.sqhk.co/rexixugepir/hjeih5j/82927904693.pdfIn PDF document text
    • https://cdn.sqhk.co/miranilu/GJL6idQ/jovagifekesosaj.pdfIn PDF document text
    • http://instahelpforbusiness.com/baby_lullaby_songs_go_to_sleepw2g2u.pdfIn PDF document text
    • http://mattelipsticks.site/781724022978qcwq.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/agenda_21_espaol.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/come_on_eileen_piano_sheet_music.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://lenulari.mypressonline.com/child_brain_development_stages.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/9HhdgdU/bike_riding_sore_legs.pdfIn PDF document text
    • http://andyhong.blog/riladanadaeectn.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/adulterants_in_foodstuff_chemistry_project.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/TjiieiL/53553016806.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/5338506064.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/3789787375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://supajiwa.myartsonline.com/wigimebutevuzuw.pdfIn PDF document text
    • http://maretubozewugi.myartsonline.com/baofeng_uv-5r_dual_band_radio.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/lezodolejodutamuz.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/razikazubibizexejemavof.pdfIn PDF document text
    • http://desigaweru.myartsonline.com/futefikupe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 5028 bytes
SHA-256: 396077ecad92b81eb55e68ac8d119a2947fba50fc1a083eb106b75a312b70c02
font_01_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 11136 bytes
SHA-256: 15e8bc94438d4a9fb6d0b98ed99b5112a4646b4e2052678292425079aa4b06e9
font_02_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361