Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a75728738d2cbd…

MALICIOUS

PDF

77.5 KB Created: 2021-03-01 12:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d8b757ffd5067df3eeb885ffae254498 SHA-1: 3127600ddffc0ef4710bb83453d35a7e1a9e7957 SHA-256: 00a75728738d2cbde2ce78638ea2a3374d0d3789ca5568e09b39766de004d7dc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://kuzutuzo.ru/123?utm_term=shark+steam+mop+replacement+parts+uk, are likely used to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=shark+steam+mop+replacement+parts+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421205/normal_600d6269a8802.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/best_monstera_plant.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/xetab.pdfIn PDF document text
    • http://cardio-active.site/vumelurikunugugorenutoxy2kj.pdfIn PDF document text
    • http://invitesistem.ru/61345702955wer60.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/22466046924.pdfIn PDF document text
    • http://luchdobro.site/titanolabapedebulaximiz3wtjh.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/Cjfhjhf/father_and_son_chords_rod_stewart.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/ihgduiB/agora_video_call_demo.pdfIn PDF document text
    • http://gratoramaa.website/operaciones_con_funciones_ejercicios_resueltosq7ia1.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/nLjhihb/ultimate_epic_battle_simulator_free_online_download.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/zamuriza/busqueda_de_informacion_cientifica_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/free_phone_tapping_app_for_android.pdfIn PDF document text
    • http://kopolug.myartsonline.com/where_does_the_keurig_water_filter_go.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/alarma_revista.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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 5340 bytes
SHA-256: 7172b98539ff8c14d49c6e45bfca5d445dea17a5b43f49278c4100f3f6588eb2
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 11728 bytes
SHA-256: e92897edb7e429d303c00187ca68e39115b38e65f802fe79b409e63cd91c3fe2

Open this report in the interactive analyzer, or submit your own file for analysis.