Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc03ed4f8de798f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 03:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 21512a95a4245a46325e44bcd96a715b SHA-1: b87db74b90b7d7b5322ce7a060f5f07e89eb7945 SHA-256: 9bc03ed4f8de798fcb5a167129a0caf0c052d994cdcccb96e4c65b6433ff037a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=boruto+english+dubbed+free+online PDF link annotation
    • http://pastoret.it/userfiles/files/9531821294.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/61074805448.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wawexutizisu.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/8522720682.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906135829.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/67602436971.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4083f2a7---nugofukofuw.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/refagivovodosoxipumeliga.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/sasim.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/bunetabofobodixos.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/mexipe.pdfIn PDF document text
    • https://successalpha.team/upload/files/35628016734.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/11314857232.pdfIn PDF document text
    • http://3asoft.vn/img/files/sodel.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/7694753885.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38864437127.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/50607712116.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/wolefi.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/birerisuteluxefurexep.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ffa7be7a---90662908073.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/gunona.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/gokakoweganarosemomalovu.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/27664093644.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f37346c186106b7ad2ccfdafb66c3200/50798403584.pdfIn PDF document text
    • https://mimpidia.com/contents/files/34035402719.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 10764 bytes
SHA-256: 0517ce8e5cdfc4ef9bf1a06caccdefeb61519040cd2a60297617fa0c888ff196
font_01_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 18792 bytes
SHA-256: 02241559d14e79cb8aa7753be7f967a0299b036ef207c2f11dc112612b7db459