Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea393732b1ac37d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 11:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd5d11ee744c59c8cf95d606b2cb905c SHA-1: e70a736abe7f72aa04c11f86bd6e645f8c4013db SHA-256: dea393732b1ac37d73a9d96a7de6688e643dbcc25d67a9cc311cb8fd37e05451
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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.
  • 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://garglob.ru/uplcv?utm_term=facetime+voice+call PDF link annotation
    • http://fasson.vip/images/editor/files/vasarivapuv.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/98943585041.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/bumimesavazezawiwa.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/laresivuwexifob.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/981b52272e7d40cbd1dae84cc6d7ec4d/25745200769.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/58546834132.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/futuk.pdfIn PDF document text
    • http://axwelindia.com/uploads/48908405157.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/76814369855.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/56437534941.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/9958702617.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/firaramod.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0ee39cca---22554294288.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/vupotuzutijibifenijirok.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/59092924651.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/12683814752.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/lukepurukutamugetofanuk.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/bagotujokaxixokedipe.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/roded.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/10679737892.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/25827548475.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/90785109397.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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10064 bytes
SHA-256: cc26ffc1deb6c87006d9e7892f6430ca641c25f697eeffadf17b498251b46fcd
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 18216 bytes
SHA-256: b4b6009ad137b8fe4443568a56a0ac27038637700814552a2f19b3a3e6803476

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