Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda7eba774f4740…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 02:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3473af23e86b9433990036fe493f4285 SHA-1: e25d110b537553a11ec48ec822728a7c77efdf6b SHA-256: 1fda7eba774f4740ec3232760e2049637cb976d94c5db4443ad25e424a0bce67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code, potentially to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=android+1+com+farmville+2+country+escape PDF link annotation
    • http://medicare-darmstadt.de/bilder/UserImages/file/vujiremux.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/47344433819.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630789972/files/38768344361.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/juzotivol.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/soriwadixokej.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/raxatekujej.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1db046ed---73693798225.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109110309465930.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xaloset.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/64770182972.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/88977036363.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/dasisuwirozuxomoba.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/95558962046.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/majobonelesivegufumo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lrac0mmt067c1l911suj9mn7tj/48357767538.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/16739830268.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/zoperisoma.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55053857528.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/zaginedevepizu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/bedidumalosadu.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34397854065.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/59069117783.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pilejivewopizu.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/2018348707.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/89543723911.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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 15620 bytes
SHA-256: f0fa9aa85c532906b5cda6e921d4b830d52aa8fe821602e453b414f0790075e7
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 11216 bytes
SHA-256: f9c9c103c43d7d48175802e466670a7092a6c2640a89ff7b395ea1e907360f10