Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf665c23635156e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 11:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cee632b8ff1e5c481290f27eb324413 SHA-1: 39cbf2842fa95ff742cf311a8879d6be1d008b32 SHA-256: 1cf665c23635156ee9b72fd264127bf9f7f99e5d06effd3d82808bff185ff3ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous embedded URLs, including one that redirects to a potentially malicious PDF hosted on 'harlit.com', suggests an attempt to trick users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable domains for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://harlit.com/upfiles/file/depilibeluzerumebid.pdf In PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/10935237281.pdfIn PDF document text
    • http://maihome.hu/admin1/file/61094847798.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/damubesuzisirokezuxepaf.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/95610023140.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/50151878144.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/xugixerubowukon.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/12722287614.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wiwubalov.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/39585489085.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zomagefejoso.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210917_110097185E523E4E.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/61297322290.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/43762570680.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tubiwoselebulosuxaferase.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478d7f17256---midetodadepokorujeb.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109151922302406.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/64070564913.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/larofaxevetutoruvusixiv.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/41745473583.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05b28f22d---29635694623.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/65318143296.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/16162739468.pdfIn PDF document text
    • https://hiroyoung.com/data/files/291447088.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/49539887189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=drive+pdf+viewer+for+pc+downloadPDF 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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 18560 bytes
SHA-256: 145fef85d9d21483ff9f03f18e9101e000eb9d89ff605bebff9a0b2392212890
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 10500 bytes
SHA-256: a357e349e7dd769d72add0a59b7fe2b965cb7d26641da71828460c27250d1890
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1