Malicious PDF — malware analysis report

Static analysis result for SHA-256 850859d06cb21be3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 00:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc15e289d0b1bcfe88ade385c99b38ff SHA-1: 00a40623e53f90f3f6d06cf8f8546fada34dc334 SHA-256: 850859d06cb21be369081b6388654f49e37b9aacf4c72ca016960993388dde40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is part of a link farm designed to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.yoko-ono.be/images/userfiles/file/sokilizinubezosevux.pdf In PDF document text
    • http://firmen-bekleidung.at/userfiles/file/baluxudenuxusokepoki.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/guzirefeg.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/nanafazabepej.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/92685025098.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/54274710897.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tenosobidov.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/16601769172.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/39440079657.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210901_E852384688A34F9C.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/ripimigogivadi.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/punude.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/68834427796.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/88643236396.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/96735864306.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sopusa.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/82051698294.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/87406742478.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gurofemararemuzujobejufuw.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/88155003994.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/42881894568.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/pazegofoleritat.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/zuvoxudolesi.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/funuxonogogizezetebafaxej.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d8217db8---fumojeninase.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/jafofidelozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cara+memindahkan+video+dari+android+ke+iphonePDF 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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 16924 bytes
SHA-256: 55108d7fffd96365b318792fd294395c951230bff22c7b5e01107c1042484bbf
font_01_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 10532 bytes
SHA-256: d6fb254ff850ced03442875f3293477ee94db2c9b5a87b326a0419d0379f6ce5