Malicious PDF — malware analysis report

Static analysis result for SHA-256 60cf012170691fb1…

MALICIOUS

PDF

82.8 KB Created: 2021-05-10 19:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 18cce5d7a5aadb437cedfb144163025f SHA-1: 7a33495af73431c3a4b4c8f528773e3db354829b SHA-256: 60cf012170691fb1126bdc8edf29b0e32087f8b4d5cc57794bdbef7500bd3834
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent URL being https://gimoguvi.ru/strik?utm_term=aqualink+rs8+manual, suggesting a phishing or redirection attempt. The PDF's structure and the presence of many links on disposable hosting indicate it's likely part of a link farm designed to distribute malware or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=aqualink+rs8+manual PDF link annotation
    • http://sewaseg.22web.org/34752157238.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/public_administration_books_for_css.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5fd64ef0df741.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/77150963091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_602d071dd8abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_60591a3934778.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/zudajem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_601adf1559fb1.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/saudi_arabia_arbitration_law_2020.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/52057864722.pdfIn PDF document text
    • http://tifiwijewek.iblogger.org/29010960151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixiwubu.rf.gd/54797831682.pdfIn PDF document text
    • http://benifolagalat.epizy.com/inorganic_official_compounds.pdfIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_96d9feffa01d4a3fb0b28070478c2d14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17451a05-48ce-4f52-8f28-a5dc905aa701/vilolaxevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b486254-1c43-43f4-9392-2128b457d824/adobe_premiere_pro_2020_v14.1_download_mac.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_a8005ba3978a41b18b719cb21617250d.pdf?index=trueIn PDF document text
    • http://bumisalozik.rf.gd/nofunosufofomito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1c815b-ca71-479a-8c4c-8a1bf0680aec/mcgraw-hill_education_certificate_geerlilii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1453aced-b054-4ebf-862b-4e17c41565f8/like_water_for_chocolate_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491aa955-0b71-4b1b-9ce9-47839a3ac964/boss_dd-7_vs_dd-3.pdfIn PDF document text
    • http://zuwosopawekaz.rf.gd/how_to_do_heroic_adventures_destiny_2_shadowkeep.pdfIn PDF document text
    • http://vaxizev.rf.gd/tugenefenanujukofiromux.pdfIn PDF document text
    • http://mepizegavipin.rf.gd/nursery_school_admission_question_answer.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_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 5204 bytes
SHA-256: 9018b8e0cca81b995a0d9843c75c730d4acc0d3894a86db7692a7d279af09ca0
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 12076 bytes
SHA-256: bac7a9235a4895285087602856b45e6e5658d1436006d0d13ed57ebe4a4d5499