Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c1b6c5a34c8c1…

MALICIOUS

PDF

77.1 KB Created: 2021-05-08 23:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 86f38697dc26bfcbce4b07e53fedd6ca SHA-1: 00a2f214b9ccdf20f5874cc5fcc7fe5178e8cad1 SHA-256: 2c8c1b6c5a34c8c131cfd0a5a65cc8a1744431d42daedd3121ab38f65236ff21
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, appears to be a lure related to educational materials, aiming to trick users into clicking the 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://ponafet.ru/strik?utm_term=greek+and+latin+roots+worksheet+high+school+pdf PDF link annotation
    • http://komozazene.getenjoyment.net/602028358.pdfIn PDF document text
    • http://begetus11ppz.xyz/tiger_scout_handbook7rr27.pdfIn PDF document text
    • https://cdn.sqhk.co/nonobepimaf/iU9icjg/70182658957.pdfIn PDF document text
    • http://leaninrzpd.site/kim_b_foglia_answers4nwrt.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hbgihez/94282717045.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/1000_accords_pour_guitare.pdfIn PDF document text
    • http://ampinternational.org/murojemejur9b0wh.pdfIn PDF document text
    • http://wutugidejavazu.scienceontheweb.net/mahalaxmi_calendar_october_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/hXzichf/best_winter_warmer_beer_recipe.pdfIn PDF document text
    • http://semasinizitowo.medianewsonline.com/pro_apache_jmeter_web_application_performance_testing.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/DjajeAM/xovefireweg.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/Pjajcel/nigajutitokuziketare.pdfIn PDF document text
    • http://nosinoski.shop/analyse_the_structure_of_a_text_examples_in_literatureixtxp.pdfIn PDF document text
    • https://cdn.sqhk.co/nimenodeloxa/3jgy3EP/diravenowawoxis.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/nawosineromigi/fofaromez.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/how_to_speed_up_my_club_car_precedent.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 5604 bytes
SHA-256: 9110de1f3bb5201ff04d63654381e7c02f42aa7e23ae59f522bf033596a89611
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 11840 bytes
SHA-256: e74a8a2e0ad0b821ebc1d12c79e11b1a51168feb7ceeb573bf3d6b2d7873e67b

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