Malicious PDF — malware analysis report

Static analysis result for SHA-256 4436a811c502b04f…

MALICIOUS

PDF

159.3 KB Created: 2021-04-14 16:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fcfd49e087ab9cdc2de839c76f3a2795 SHA-1: 7dee69ca3dd387f9a1e746b9d05537039eaebfcf SHA-256: 4436a811c502b04f9e92026cd39e13c75c6f9db4c1f36a6ed6020d0a1f4f1e8b
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to a disposable hosting domain, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and external links indicate a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=what+did+vladimir+lenin+accomplish PDF link annotation
    • http://xoxuvajes.mywebcommunity.org/13849898650.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/iRja5Ri/rofagemixif.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/Advjj6Y/xajufos.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/dixiw.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/MifNOgg/water_slides_near_me.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/astm_e8_e8m_15a.pdfIn PDF document text
    • https://roxupabepali.weebly.com/uploads/1/3/4/6/134611875/muzalugipetaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/hiYigs8/ringtones_free_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/hd3jeii/should_and_shouldn_t_printable_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/dnZ77jd/52107302850.pdfIn PDF document text
    • https://cdn.sqhk.co/tunixomaj/fYJijji/chelsea_vs_arsenal_highlights_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejujerun.rf.gd/anatomy_for_3d_artists_chris_legaspi.pdfIn PDF document text
    • http://jerefepebox.epizy.com/dna_replication_practice_worksheet_answer_key_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580ec150-ff68-4361-bb9c-75ea7493e5c0/96460149561.pdfIn PDF document text
    • http://xadeboni.epizy.com/rigitawitejitunegadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c5612e-e3ea-4b7c-9a69-f995fcacb484/how_to_connect_my_onn_soundbar_to_my_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8f993e-9750-4076-8dfd-0bf3c1eef011/is_the_magicians_season_5_on_netflix.pdfIn PDF document text
    • http://pobediwawe.epizy.com/54358107183.pdfIn PDF document text
    • http://wiwowefitupek.epizy.com/benzoato_de_sodio_ficha_tecnica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5993d809-9b61-4ee9-86c2-a3f22fdcb95f/how_to_use_hx_stomp_looper.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_off0002362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2362C 5388 bytes
SHA-256: 07c0b7ffe0b246e620cc96fd5179535e360661c1b69baee1ab7f45550fce6b6f
font_01_sfnt_off00024860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24860 12080 bytes
SHA-256: 8c578f8c8d1a3abbe1bb061af3ccaab686608b82c56bff28ae9849fb2b7984b9

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