Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37f6586048ccd91…

MALICIOUS

PDF

72.9 KB Created: 2021-04-03 23:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4fe3088bb1e1b97f7d91d67fc9c03b3 SHA-1: 7ff4a0b14b2a21cbf59d3a33815321f49426ed92 SHA-256: d37f6586048ccd91750926b5db9fedd034239fb719e34e550c285243bbd8f1ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'https://xezojetit.ru/strik?utm_term=how+to+analyse+stocks', suggesting it's part of a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+analyse+stocks
    • https://cdn.sqhk.co/gonolesuzam/jib4Ghg/80945906174.pdf
    • https://cdn.sqhk.co/ruwonumatag/hg6zmF9/skyblock_island_survival_games.pdf
    • https://cdn.sqhk.co/resozasevej/hhhnxSc/hot_rod_car_shows_near_me_2020.pdf
    • https://cdn.sqhk.co/zenetofuma/eGjgOhc/vutajazusoranam.pdf
    • http://niluxedofodip.22web.org/yamaha_dgx_205_keyboard.pdf
    • http://kedepoba.sportsontheweb.net/giduxinarigojutifej.pdf
    • http://latozon.iblogger.org/whatsapp_sticker_maker_pro_apk.pdf
    • http://zomixuxoluzijum.mywebcommunity.org/online_merge_software.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvemasoxaji/63721953830.pdf
    • https://s3.amazonaws.com/murudute/vejaboresad.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_9d94198d5f434ef99db6fb723efcd3be.pdf?index=true
    • http://tuganireriwem.rf.gd/sports_illustrated_magazines_worth_money.pdf
    • https://s3.amazonaws.com/fekaduvopigab/lozuvozivodugeg.pdf
    • https://s3.amazonaws.com/gedimuta/13589010270.pdf
    • https://s3.amazonaws.com/vonutavekip/descargar_diccionario_espaol_portugues_brasil.pdf
    • https://s3.amazonaws.com/pululusodogi/heroes_of_the_storm_genji_guide_deutsch.pdf
    • https://s3.amazonaws.com/difigomisosak/52427803569.pdf
    • https://s3.amazonaws.com/zozofufulolig/budokofil.pdf
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_c93820a40feb4c35b4c662727d095697.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_1c5101a6787f493fbbd301142df9d7e7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ca.bin
3c6d4e006353687499b07c64201889de37a1bda76a21721210171493052de128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 4916 bytes
font_01_sfnt_off0000f1af.bin
469e6fa5d265e4c4f977edc73bad60e22fbcb97f354cb9f71820be8d7d70bd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10900 bytes

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