Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eff2839471d83e8…

MALICIOUS

PDF

77.2 KB Created: 2021-05-17 11:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8dadb8c4f567f097e9047061d61f9c8c SHA-1: ecc9a348eb282a8607bfe952fdad95b08a0a2e88 SHA-256: 3eff2839471d83e89930342e49a0bcbb190a20876421e0e87d37a17fe62cc9db
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, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('druttle.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to obscure malicious links within a large number of disposable domains.

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://druttle.ru/strik?utm_term=carlos+marx+teoria+del+conflicto PDF link annotation
    • http://fullstacket.online/furosomukudewejijugedf6s7p.pdfIn PDF document text
    • http://akvatehnika74.ru/bizerba_st_service_manualsr0b2.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/arduino_uno_digital_pin_input_voltage.pdfIn PDF document text
    • http://sajitalunaded.22web.org/aetna_provider_claim_form_uae.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/bank_po_english_preparation_book.pdfIn PDF document text
    • http://zumubexupon.22web.org/ferinu.pdfIn PDF document text
    • http://kuvijuwe.22web.org/the_basketball_diaries_jim_carroll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebusepuwiri.atwebpages.com/99401072100.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/junovonalobob.pdfIn PDF document text
    • http://guwajip.epizy.com/a_suitable_boy_book_review_guardian.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/anatomy_and_physiology_of_human_brain.pdfIn PDF document text
    • http://livodubudo.rf.gd/meiosis_webquest_worksheet_answer_key.pdfIn PDF document text
    • http://tomafidom.rf.gd/71707382707.pdfIn PDF document text
    • http://tikumomono.rf.gd/blades_in_the_dark.pdfIn PDF document text
    • http://lakitedovu.rf.gd/debenture_account_in_balance_sheet.pdfIn PDF document text
    • http://vefabafodibejeg.epizy.com/history_of_kashmiri_pandits.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/bullet_raja_full_hd_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/30565601955.pdfIn PDF document text
    • http://tudefoka.epizy.com/libro_el_bestiario.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/82376208976.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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5140 bytes
SHA-256: 5c5f9c93a4eac8655c3b8bba00e95c965417812738f2e0d9fa30730d7fe31ed6
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 11400 bytes
SHA-256: 9d97d5a92e87f580d864b73a71c08e330f496c8d188758f61d02f64986edb228

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