Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfc027aba6a8100…

MALICIOUS

PDF

77.6 KB Created: 2021-05-09 16:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eae0a7bf31dd08967194d2d915f2d587 SHA-1: e652671c6c658cbd4b4eae312f436334aa80d0b7 SHA-256: 8dfc027aba6a81007bdf21888b5f128dd0fc41318969a98a1d0928ccae3265c4
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm. One prominent URL, 'https://ponafet.ru/strik?utm_term=ge+universal+remote+control+codes+for+sharp+tv', indicates a lure related to remote control codes, likely to disguise a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL distribution strongly suggest a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=ge+universal+remote+control+codes+for+sharp+tv PDF link annotation
    • https://cdn.sqhk.co/suwuwewazaka/dih8egj/656679418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_606c9eb5ef698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ffeb75995bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423732/normal_5ff9d6eda8e0a.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/50161306833.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/iidVFnD/concentric_diversification_definition_economics.pdfIn PDF document text
    • http://iglivesupportteam.com/37490265606la9wg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466391/normal_600574be8b7c7.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/85239235415.pdfIn PDF document text
    • http://top-salez.site/31634750525z54im.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/relation_and_function_definition_in_hindi.pdfIn PDF document text
    • https://cdn.sqhk.co/soribivevi/oWnq7b2/91229748584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovefepotulat.epizy.com/animals_worksheet_esl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee9052b-bdfb-4999-9306-759226df9cf0/audre_lorde_quotes_on_identity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a857d4f-9ef3-48df-8694-cd01a4a22d0d/wagitakubige.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/voxagonubaligopizopowamij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fbe9806-92d8-4df1-a396-371363af6d1c/how_do_i_use_my_mazda_remote_starter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621c4ae1-bf40-4b6b-9b86-69ad1b6b1172/what_was_the_us_like_before_the_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c07fa3-d54c-47db-8df4-9287f618bcce/how_to_assemble_ingenuity_smartbounce_automatic_bouncer.pdfIn PDF document text
    • http://lujotuxubegu.rf.gd/best_algorithmic_trading_books_python.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/how_long_do_you_cook_frozen_turkey_burgers_on_a_george_foreman_grill.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_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5484 bytes
SHA-256: a424c9b4200df42244be50063e974d3c7b644850452f4aeddc9d7ed7a1119197
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10660 bytes
SHA-256: 0568e2c4f2a87c9a4f438217e9970204148ccdfe6095f80dc4f81197a901b061