Malicious PDF — malware analysis report

Static analysis result for SHA-256 40774e18720e3b48…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 16:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8001f961b49288d2244e0915b7453ca SHA-1: 31f52e8ec9eac6b7827b1297e9decc59613bf855 SHA-256: 40774e18720e3b489fcd4e0fd3be0221bcef8962b5dbac633446ecb48824902a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links to disposable hosting, suggesting a link farm used for phishing or malware distribution. The embedded URLs, such as https://pistant.ru/uplcv?utm_term=descargar+teclado+del+real+madrid+para+android, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=descargar+teclado+del+real+madrid+para+android PDF link annotation
    • https://hophamthaibinh.com/upload/files/wexegobewujojibabijeg.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/22986096009.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/ponuzidojagutaf.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kakaxufepa.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/titekoju.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/54368493447.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/peridenafosonur.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/nabamefoz.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/31333902005.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/vexinenarare.pdfIn PDF document text
    • http://asfalon.com/__files/file/18303701749.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/guvanumasoletasodivo.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/wanujumeregalenazis.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/fikefonarubo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613947348dda4---78318986077.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/17337667700.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/fowanazis.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/zunobelexirinukedawukiri.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikirubavex.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/padodawezegunigulav.pdfIn PDF document text
    • http://hoachattn.com/image/files/soluzesuxozikoge.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/sagititegivugomijijewip.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/44848472181.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/silam.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/93596084185.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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 20724 bytes
SHA-256: 021fc4a656a831b079afea49d46c8eeb93181b00546be7352b29231abff3c27e
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 10856 bytes
SHA-256: 1e19033a0b4fb6d161e193f5f71fc617bfb28265b9430d8f1f410d3484c9c3d3