Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5058edfd24b180a…

MALICIOUS

PDF

91.8 KB Created: 2021-09-13 05:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbf7fdfd82c123a8a79a9aa4272f38a9 SHA-1: fc60b0db45f9ef791f2b761c3e06f1e90b8421fa SHA-256: d5058edfd24b180ace2e6f087824c4c7b56cda90fb557b788cb53adcdd75f593
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dambi.pl/userfiles/file/novosileneto.pdf In PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/joxapaveriluje.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e34a3093d83643435723b116d8003d0b/zowusabekadurawi.pdfIn PDF document text
    • https://akconta.com/uploads/files/terixisarigivu.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/88407461167.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/goxazebilejimuwe.pdfIn PDF document text
    • http://calisnt.com/uploads/files/ketapamazigafesuni.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d38d263444---10402280210.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/xuzobefimiv.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fokoxemamuwagirula.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/zijovezajedowofapetubu.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/86053389402.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/89580728923.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/39800467572.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/22922182374.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/26008096519.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/tibevoruduw.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/fotapobiwo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/duwejanosulajoturoleg.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/jilekatogokadem.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/lulexoluwezobibolajexes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=easter+prayers+of+the+faithfulPDF 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_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 18656 bytes
SHA-256: 2e88e38a64ba7997311025c2b106456c7070afc116784b6fe0919c4d31a4cfec
font_01_sfnt_off000131e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FF 10548 bytes
SHA-256: e8af3f41268bf125ff54387e2ed144b208cbaf51773a63ca1c79e588b9c952e5

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