Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ba0cb0c07c23b2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 19:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8889018ed8e21d7f59eb3dc249b4a4b SHA-1: 4f10fe1666f04250de114d9e86c9569cc731a68d SHA-256: e2ba0cb0c07c23b2504dfac5e85f22472c74c2f0b82b65e4e9b5fb59d403fa2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which appear to be part of a link farm designed to obscure the true malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content. While no scripts were directly extracted, the PDF structure and numerous external links suggest a phishing or malware distribution attempt, likely involving a malicious JavaScript payload within the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://techscreening.com/userfiles/files/vapanividijokidoluz.pdf In PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/duleta.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/gopuzojuposisejivoxisu.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/najapojonawunisa.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/42852249842.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/dosogamazivob.pdfIn PDF document text
    • http://njxinbell.com/upload/files/87648460718.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/robefawowopuzizaben.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/40194299994.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c44a147fa---pujamakemew.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/rulamigekaxaf.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/24821502367.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/23408383404.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/varumif.pdfIn PDF document text
    • https://vitanov.rs/files/golijalararag.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/92370491776.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/sipibuzixojorewukasuzozuw.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc8cc9c97---56714896314.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/penizolubinanafovovul.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/73802085320.pdfIn PDF document text
    • http://risme.vn/files/90098440199.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/22674805188.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/1865810335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=street+racing+3d+mod+apk+free+downloadPDF link annotation
    • 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_off0000bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 11220 bytes
SHA-256: cc81f8aa10000b8d347493fb7a314715646743a95b96b84704a0f53c1aa77fde
font_02_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 16448 bytes
SHA-256: 0be3442a8d6dca305c63233f248429c9abd4d5b3cca35c51a2d6a90aede0d5ec