Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cebea9f6527b3b2…

MALICIOUS

PDF

80.9 KB Created: 2021-04-18 03:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1df5c9499f94b2fd0128b53d049a2dd0 SHA-1: 26be52fc1aa4d28b3e673f121837bbf04fe41723 SHA-256: 6cebea9f6527b3b2ea3b9412f6bd060f892ca4964ec321cba79c194dd7f6ac9d
184 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or known redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to lure the user to external malicious sites, aligning with the T1566.001 (Spearphishing Attachment) technique.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+secret+garden+restaurant+placencia+belize In PDF document text
    • https://cdn.sqhk.co/xovujiroveg/igjaegg/max_cleaner_antivirus_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5fe66bb945c17.pdfIn PDF document text
    • https://fibusoza.weebly.com/uploads/1/3/0/7/130775704/vegoji-fosevi-jafubakam.pdfIn PDF document text
    • http://raifaisentgo.online/themes_in_oedipus_the_king_by_sophoclesv8d27.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/lokosodi_ziwewuvozate_tawadeva_mugurowudoga.pdfIn PDF document text
    • https://cdn.sqhk.co/polirorenu/dgdUlFh/voice_changer_app_during_call_download.pdfIn PDF document text
    • http://feelslike35.com/economic_development_partnership_of_north_carolina_jobs8fmb2.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/dRNjcaX/voice_recorder_app_for_pc_free_download.pdfIn PDF document text
    • http://hesap-al-sat.com/2238852217ycsf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60127fdb54706.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/0dec434880aa.pdfIn PDF document text
    • http://ejqy.com/rokogisetbeis9.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/ogh4UIm/general_hospital_spoilers_next_week.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisironebininuw.rf.gd/how_to_draw_furries.pdfIn PDF document text
    • http://jifaradazuzigo.rf.gd/convert_website_to_on_ipad.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_57d7d02d69254cefb87540b8e26254a9.pdf?index=trueIn PDF document text
    • http://duketududolur.rf.gd/92247136829.pdfIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_eb3624ac90594e37a0b7511af37f0744.pdf?index=trueIn PDF document text
    • http://desabukil.epizy.com/71572202545.pdfIn PDF document text
    • http://wuxatafadakifu.epizy.com/oracle_sql_coalesce_performance.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_472517bbd4fe40bf87324f68eab2324a.pdf?index=trueIn 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_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 5472 bytes
SHA-256: 23153993eaaa700b08478dbec57e8256c2610f91d44812249669d65bc2a08548
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 11344 bytes
SHA-256: cd9acc0fb6e9e1d033fba0cb415035cd7894d980010857f0c64e4f026ef61c4d