Malicious PDF — malware analysis report

Static analysis result for SHA-256 43500f94767052a3…

MALICIOUS

PDF

85.3 KB Created: 2021-04-29 02:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b5f271ab1ebaa6cb5f1687c0ef30fa9e SHA-1: 9c486ebe9ac3e57cab19fce751622bb62b5d2afd SHA-256: 43500f94767052a389c20b9d886743783704136a23be25f1d9565862a983b546
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic indicating it's a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of many external URIs suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=thanks+for+the+feedback+pdf PDF link annotation
    • https://cdn.sqhk.co/losokifape/bIjcPjf/learn_game_development_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/jie3geJ/1133731610.pdfIn PDF document text
    • http://ponoxavar.iblogger.org/widudaxibotesaxigure.pdfIn PDF document text
    • https://cdn.sqhk.co/tanemurad/gf1r6ii/official_premier_league_fantasy_football_app_android.pdfIn PDF document text
    • http://liwadaxezaf.getenjoyment.net/13883018918.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/jcxyzCV/switch_pro_controller_blue_light_stays_on.pdfIn PDF document text
    • http://lujovotoloxes.iblogger.org/vewataxerujerajogawofe.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/BKkJhaV/flying_to_florida_from_chicago.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/9jcgdHI/2013_infected_wars_ios.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/56338622088.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/josogalujatek.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/35860580469.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/mjijjSJ/36680768776.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/Uhbiiig/tojejizup.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/spiderman_colouring_pages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besafetusupug.atwebpages.com/perfiles_de_aluminio_para_ventanas_corredizas.pdfIn PDF document text
    • http://nogevewibavulur.epizy.com/sagorev.pdfIn PDF document text
    • http://wogafut.rf.gd/loluzoradixobepudusul.pdfIn PDF document text
    • http://palopotezaval.epizy.com/garmin_s62_golf_watch_best_price.pdfIn PDF document text
    • http://rubedirixadul.epizy.com/4501129660.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/88553494653.pdfIn PDF document text
    • http://fusuzuveraku.epizy.com/minority_report_trailer_music.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/present_simple_vs_present_continuous_exercises_test.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_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 5364 bytes
SHA-256: 09aaeb9ea44f0a5ef4f10d0ad9c0366f388440b3dfabb39a5d00bb17ed141821
font_01_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 11800 bytes
SHA-256: f839445e218fcc2395c2c1160341c1e62be861233d2168fe06bceeff03df42cc

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