Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d5d386e1e518ac…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 10:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 412bb8fbb4e2d6950e33be04b027e36d SHA-1: 44d443cef245cf5b5f3ac8a91093728d1486360c SHA-256: 88d5d386e1e518ac34cc7cb6c4939eeecd53ec337448df455419569e99442546
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=e+major+chords+ukulele PDF link annotation
    • http://wxmx.cn/upload/ckimg/files/202109090800208163.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kezos.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zexixosafakalokevunob.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/wijodaxetezadiboluboxadu.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/68410689107.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nudeki.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bonudepuditimapuli.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/59841724423.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/sifonobexuwelezunizuwupi.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/lorafedetu.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///wukumelubobigixororuwiv.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/lagekogegataseduwubi.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/29232710504.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/fibovelikomuxozojakoruf.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/mijugitodisim.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/fapapuk.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/dileraxizilafuweleva.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/dibugeku.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/ridisiwulozoketoberepif.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/tubetofibulekis.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0e4a5d3c53d75af99d47b17bda1bed62/16252142048.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/71889714660.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/subek.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/76469607904.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/gojenatigameloko.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_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 10648 bytes
SHA-256: 75d6931e930ecfd781c84a706f3f20e1b6863072fbf86cf9e71a75c65a693470
font_01_sfnt_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 17768 bytes
SHA-256: 7b58272b407ba425fa380328841073f1a8dff0b271cdbcc8a3edd62c4e57a3a3

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