Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f80a958eabe39…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 15:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e404437dd6a2c7eb38011da8893b3b83 SHA-1: bd6db7a1463b8f59a90d847b120021a6a61254cd SHA-256: b85f80a958eabe3967b09ef2597a4fe99465a2ef330eb372c7b3a6ef9918c55f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=seconds+bryan+lee+o+malley+pdf PDF link annotation
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/62891125047.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/22874737709.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/36107311331.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/ratozomavana.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/xotikagipivan.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/fakubadefeja.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/varejosok.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/woguluwalabebitu.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/14092885615.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/lixotabu.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/99862001585.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/74446209747.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1cae3ed307e5353c95d62878ce8e5295/witedebumen.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/xabamofusabutoxedipusu.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/28394063292.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/jamujoriwuzamano.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/96846655536.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/puxawizolemafonefew.pdfIn PDF document text
    • https://kermanrooz.com/img/files/debadujebum.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/xobebam.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613020e23f5e2---sisepematonolubozix.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/juzejorinalak.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/gasazulirefaso.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wizorijasupavufibapubura.pdfIn PDF document text
    • http://cecev.com/stockages/files/91067483465.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/93629650109.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/govubuwisowuluba.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/sewetepuwekidakezedesu.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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 10920 bytes
SHA-256: 340a1bacf91f2712fd30ab9150977e7de99eb83c963be45eac81615054ee3e8f
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 18928 bytes
SHA-256: 1c4033175b0244ae04935469a1fedf3096f5a6e5dc2284a768fd7c626430b2b4