Malicious PDF — malware analysis report

Static analysis result for SHA-256 10177d45845c3984…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 14:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01c127cc6f683a9d09e7eaeece53833f SHA-1: c00d08d50e81a5437487edfe13906c960ef52835 SHA-256: 10177d45845c3984a1c9d1b600569d87c32d23faadc09fc0fb3126800744b833
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a large number of external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://shibbirs.com/media/files/mafid.pdf In PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/36124335561.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5f5222a5---dotovavujepapisejufog.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/wojibonotivepuzivi.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/17432033559.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/toguzuligidozipadigebari.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/84347442780.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/wasaxaleli.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/muzajamuwab.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/luxugagutotofoxog.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/pigivivusiwowutix.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/gekuxotojoxalevizurolo.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/73385469180.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632420967994352267.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/91316786394.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/30574008200.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/xebilejof.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/zevivalug.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/71382722504.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/31994831910.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677fde1023---25645823737.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/kunaximikuba.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/88967674873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+draw+a+soccer+ballPDF 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_off0000ae54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE54 10384 bytes
SHA-256: f2655404d2d1413ac2ac696fb5522c1a5f6bf736af38e5f9027334329b7e3c7d
font_01_sfnt_off0000c601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC601 15848 bytes
SHA-256: 5eb5762f46261ff2efe4cf060194f7c7dcf74c19854ed7d1999fbcb0b73f90e6
font_02_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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