Malicious PDF — malware analysis report

Static analysis result for SHA-256 a091ac40317fa0ef…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 16:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 044aba8d7b19fdfdee089543b2acc484 SHA-1: acd2a9145e377a3dec0a363a691e133c4f6f06aa SHA-256: a091ac40317fa0efc165ca0d781baa8ed45e3d1bca18fb6e279e37bb6a2ef236
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware delivery schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://ritadas.in/userfiles/file/71613284328.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/231f68029cbb79f8c798ecdfd7fcd5a8/xuzebano.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/6641569989.pdfIn PDF document text
    • http://sdes.in/uploads/fubejuki.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/bikaporasogiletigamawune.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/31110275503.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/fizegal.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/mimowezi.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/gufisurovuk.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/56509581952.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/92608963739.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bizigubuk.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/mafegexajojokowavobip.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/50565329696.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/gugazavuga.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090416100752.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/fomafezujifazofogakudeb.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec2a075b7---vutaweli.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/pumof.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/wikomumimo.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/40052999153.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132335a8a54c---xijopebugevem.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xagukafo.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/38270168042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=app+cloner+for+gamesPDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10612 bytes
SHA-256: 3ad5e249e4bb75b488e67e5c4d6aa9d62603b4d476d52019daa4b3fd3f2c7c3f
font_02_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 18184 bytes
SHA-256: f15439fcb661afd2c8cb75882b216f6a0ce9af96d7464c2809b4d0e71e6e341d