Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fef1c3eb8ce48a…

MALICIOUS

PDF

73.6 KB Created: 2021-05-15 17:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 573a3ed1b62d2b93f3e3bd9b52785056 SHA-1: 74e7b83038ee9882126476858b2c33d763b4ccde SHA-256: d0fef1c3eb8ce48a87ed8689a09c7c1a78d36e724334abeab0cf1b06904b79f9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one pointing to 'resalured.ru', suggesting it's part of a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=can+hormones+cause+thyroid PDF link annotation
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/3343823.pdfIn PDF document text
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/nipawigez-rotoduna-rabivefesojeg-kilanimon.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/dhdigy4/47882840229.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/CMijhj9/real_football_2012_games_for_android.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/73401422694.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/vutexetom.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/35686787285.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoxezoza/ielhaia/chocolate_cake_recipe_simple_no_eggs.pdfIn PDF document text
    • http://fusobilel.iblogger.org/apache_tomcat_9_on_windows_10.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/wogumabebalumezidubo.pdfIn PDF document text
    • http://womirewuzakuf.sportsontheweb.net/allen_carr_book_stop_smoking.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_1decacbf75924dc582162a876b14cdc4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/44098582952.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_1164b27431c74745a913af82f1cd86cc.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_e96573deff714b6f9452d9cb8a942c9f.pdf?index=trueIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/the_story_of_ruby_bridges_by_robert_coles.pdfIn PDF document text
    • http://damikofem.rf.gd/picsart_background_hd_images_blur.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/nesco_pressure_cooker_pc11-25_parts.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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 5152 bytes
SHA-256: 390a7a6de91c14e4cc0fa5bc30b478573bb78f7d2342cedfcb5d63baa86affbf
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 10428 bytes
SHA-256: 88748ce761f56988623982ba5d4a8604756c515501ecfe3671ccd3cb6c783ee0

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