Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed33f08c02e4aa9…

MALICIOUS

PDF

101.6 KB Created: 2021-09-09 00:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c76218f37cd410ffa8903d32d211d4db SHA-1: 0151ca4720d811559cc5d160ca6c17dd9a433b47 SHA-256: fed33f08c02e4aa9ac04391e8dd7fd4deece82d2979dc4aed7eadffa4f1445c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous links suggest a phishing or redirection scheme. The ML classifier and ClamAV detection strongly support the malicious verdict, pointing towards a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=make+apple+watch+work+with+android PDF link annotation
    • https://somogyplusz.hu/files/92156301635.pdfIn PDF document text
    • http://scro.ru/pic/file/92168020282.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/jositijagobiw.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/43429156433.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/xinovisemoxazovo.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/legowasojaxigexab.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/lonununerifupat.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/16932000347.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138398b1ad57---54066043457.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/tufeludefowegeja.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/kufuje.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/netuda.pdfIn PDF document text
    • http://land89.com/ckupload/files/81266281430.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/pifem.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/zogopatumezomavawimugilis.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/47258063170.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/bafimurukalowepepudavaxot.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/fuzivot.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/15541601649.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xekuluranikut.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/69929713458.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/99261293696.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/77252474072.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/kugolulijenoxanopujafisuf.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/gojapakazufajilesarojofi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d08ac7944---gubewaxumile.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_off000127a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 10612 bytes
SHA-256: b5502f796b480b167926f7b48dd492618c3ca3d52ef5a80cdb8e930ee3fd413e
font_01_sfnt_off00013fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE4 18300 bytes
SHA-256: 41752d4a1b6b0a826cb3c031753cd60ce433a185888e886cbdfb0433de88e840
font_02_sfnt_off00016ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1