Malicious PDF — malware analysis report

Static analysis result for SHA-256 b575c510e92bd4e1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 04:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98c704489239af8c2545723ac58794ea SHA-1: 38ad0d806b8467a399dcd7e641acc35053f98755 SHA-256: b575c510e92bd4e1b1a5abedd9e1a941be3a6baa58a3c1ceaed11c465e759183
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=how+to+upload+pictures+from+android+phone+to+laptop PDF link annotation
    • https://sogelec-eng.com/files/ckfinder/files/32314580092.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/warukajojuzonuseruse.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/dumil.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/fabutivefiwikokari.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/noxarolasadoveximono.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/pevugifusu.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/78785576721.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/42497777694.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/18619546420.pdfIn PDF document text
    • http://freeorden.com/media/file/nimabijeparogiwegikabijex.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gizugeluzutupukasul.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/8045991186.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/57554968328.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9995891a---lasufevite.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/kisutebibawezal.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/49152984958.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/jubawenul.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02d000e62---faxobuwefefogafaratulozu.pdfIn PDF document text
    • https://songhong.info/userfiles/file/53615242137.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/15315021550.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108311704271762.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/bafipifamejavonapubuzixo.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/sekigobivole.pdfIn PDF document text
    • http://unityproductions.com/upload/files/nuvakosowosowazu.pdfIn PDF document text
    • https://onlinendttraining.net/files/lapogukiwiwodiwunixiw.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/59712500527.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/15496958946.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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 11064 bytes
SHA-256: d4d6975705ae00d5c60515dac12e788f7c6b0cd7122f73b2760dc0b1144a5edb
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 16412 bytes
SHA-256: aba0bd1378b347d046639c25dbcaf5f83c093d53df000251b5464dfd56acde25