Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0eb78792913d7a…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 15:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 084ceef606700b17b93e73406c47987b SHA-1: 0bad3ebe13f35549e59575f43db307d09c818d2c SHA-256: dc0eb78792913d7a5a3814e55e807847ba41f7e7508c24001bb7ab31d7cc8845
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs, many of which are unknown or potentially malicious, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://shriramashramps.org/userfiles/file/49247331901.pdf In PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/59556721754.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/mogovubudiraxolorizojoti.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/46373647077.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/3424053071.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/pifokarufitumovomajokoloj.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/bagibut.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/jexuden.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/5372298046.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/rovutonetasigalijowuw.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/rutekodikuki.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/fomemagewadujubarapeko.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/87728008346.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d8798c179---lanufinukevex.pdfIn PDF document text
    • http://robbes.nl/media/files/28185884467.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/93038138132.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/28916253873.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/denakekokor.pdfIn PDF document text
    • https://citronel.com/userfiles/files/23497005826.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94f86cc18---77153523648.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/buxikefevibudesuri.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/1766281814.pdfIn PDF document text
    • http://okvin.org/userfiles/file/ropanixapopimu.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/32882345789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=open+source+android+app+makerPDF 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_off0000ae95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE95 10748 bytes
SHA-256: a8f12394d8dcbc312e32afbcfbcb0c8ccc807ce9359614feb84e5686bb2bbae1
font_01_sfnt_off0000c74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 15084 bytes
SHA-256: 3a0a15b5d0a96082c26367eaa44d761e904000a70d4fc525d16fe89fac4287af