Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a8d9f594f20471…

MALICIOUS

PDF

84.3 KB Created: 2021-03-14 22:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5e6064434f3eb486b1689025c0e229e9 SHA-1: c3b6c7eefdcee436724b444b5d8de40342029cd6 SHA-256: 37a8d9f594f20471640d7da024647c7cd01782154d4b057a0fd3cef7cbe38f86
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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 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.
  • 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=matilda+roald+dahl+pdf+italiano PDF link annotation
    • http://fuvagezilavez.mygamesonline.org/where_can_i_watch_season_11_of_modern_family.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/how_to_jump_higher_in_zelda.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/mefakedamaxubunupogesibe.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/jhieogg/easy_way_to_make_clay_sculptures_without.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/us_army_reserve_drill_pay_scale3voul.pdfIn PDF document text
    • https://forozuzatopu.weebly.com/uploads/1/3/1/8/131858118/a1ccfeb28fc.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/fekenukufa_dowefexabedusel_zumifabe_mapukases.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/pioneer_av_receiver_vsx-532_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/hbSgiqi/29192425489.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/hge35lN/56078440237.pdfIn PDF document text
    • http://lesantyqas.online/80969096228g9sgu.pdfIn PDF document text
    • http://podjem2.club/income_tax_calculator_using_form_16iw21t.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/Pnib1eY/vitubonusadegogo.pdfIn PDF document text
    • https://telewapoki.weebly.com/uploads/1/3/4/8/134897398/d56e3e2.pdfIn PDF document text
    • http://cg-designer.xyz/54555667677kz56m.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/fakatebovifuru.pdfIn PDF document text
    • http://ellmax-site.xyz/87148570738vf5f2.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/heKjaic/bulibexewijaduruwiwoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0caede34-4dc6-452d-bb12-3d5d95613248/nic_6680_monitorizacin_de_los_signos_vitales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42346397-1452-4cb5-8b99-e7220888f466/rheem_tankless_water_heater_troubleshooting_29.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460df4fb-6735-4747-aa1e-ea495de0bfce/bandura_1977_social_learning_theory_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119ecd7e-729c-42ea-b234-10b9a4beeb29/the_fiery_heart_bloodlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b52c00-f079-4fb7-a09a-37a5a191ae45/5713467691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcd5d8a-353c-4122-abc5-b2cff1a43b8a/jizuponigafibipalebekegaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f569c42f-1814-43cb-93dc-d53474b70e65/la_hora_de_la_estrella_pelicula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/facf83a1-e904-467d-b7e7-68b8be67f2cf/62011426657.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_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 4956 bytes
SHA-256: a3eac3abf1c0870baf30b8fa0677d9e77025c682666ae103ffcb3e03d92fbff1
font_01_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 12448 bytes
SHA-256: e3bf754b876f4dba82ea77e37178b7b02ccb3400657983a9aa70208d3383b257