Malicious PDF — malware analysis report

Static analysis result for SHA-256 6def39a95031b688…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 14:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 16d2653e7b809104391485b7c28abc28 SHA-1: a1eea7649916c41c4e11762293b2088f70ba4656 SHA-256: 6def39a95031b68899aaa35d6d916939e0e6d315f670b2cfe76518c37fb17276
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=fastest+dd-wrt+router+2020 PDF link annotation
    • https://cdn.sqhk.co/nazamesuwute/eihD5jA/chatbox_chat_call_meet_here.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_603041f4a3354.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426966/normal_5fdfae7e8182c.pdfIn PDF document text
    • http://vumejopiraxu.mywebcommunity.org/38329854496.pdfIn PDF document text
    • http://kejamezegujoz.iblogger.org/how_to_analyze_data_in_excel_spreadsheet.pdfIn PDF document text
    • http://dipufuvolog.iblogger.org/bell_less_top_charging_system_blast_furnace.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/gheghji/17000634703.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/d11hche/cost_of_advertising_on_facebook_marketplace.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/gta_san_andreas_cheats_ps2_file.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/dibuwera.pdfIn PDF document text
    • http://jagodaxusix.iblogger.org/what_is_the_quest_of_jason_and_the_argonauts.pdfIn PDF document text
    • https://cdn.sqhk.co/vonewesipan/jdiibje/cancer_informatics_sage.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/ierThdl/26812390163.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/Rhi4Ghg/lutigaxepudewulijovikasi.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/bqvTge2/ikea_dining_room_chairs_covers.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/hcNjbib/difuvozurovinolajidow.pdfIn PDF document text
    • http://zarujosusaxom.22web.org/ratagimibipadulukupuxinuw.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/W9id4re/75951380742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muluwokixo.onlinewebshop.net/alimentacion_consciente_suzanne_powell_descargar_gratis.pdfIn PDF document text
    • http://kimigabajo.epizy.com/varicocele_tratamiento_medico.pdfIn PDF document text
    • http://femagela.myartsonline.com/biochemical_tests_for_enterobacteriaceae.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/iyengar_yoga_for_beginners_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/xotikaxorotonuroju.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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5140 bytes
SHA-256: 844238731686caaecf5643f1f40a1cd77f8f49e3fd98ef930f9818f723bb1d13
font_01_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10836 bytes
SHA-256: ecdb99451beb9e6d7b529e505f1ef50122aad751eaca8a758dcdab4a5f21b132