Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7980c3efcb60ce…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 554564cd07390a3964d5a1c74ef97bd6 SHA-1: f3b35b3615e6c57bc889457e6019f36b0be79e1a SHA-256: 2e7980c3efcb60cea22eb86676a64f3a4dbf5c3ecfda092ecb0e14b4dd686bb9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=pinched+nerve+in+arm+symptoms+treatment PDF link annotation
    • http://omegapizza.net/uploads/files/73699139202.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/1384297333.pdfIn PDF document text
    • https://laser123.com/geektic/files/tosibasifajigidizixisu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139918b11564---dibed.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210910_E6DE102155B5EA8D.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136831ec33af---popipawerozeti.pdfIn PDF document text
    • https://polytex.de/sites/default/files/josabuvuga.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/879049196613253c898ad7.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/55334280982.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/8737356054.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/rezadulojabatiwulopewuka.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/dibisikenibozozilu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/13078792457.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/26113502378.pdfIn PDF document text
    • https://harom.ro/files/file/rukatunevumotuluten.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/worujezogelarobus.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/keroduvapuxewatosujosak.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/lufavedofetogisazog.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/vakemetuna.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jupasoxamataj.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/jezowaninimegifa.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/41008909586.pdfIn PDF document text
    • https://everestart.com/images/stories/file/37300549551.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/lelowuvu.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/vesebevewowilutuxat.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/zajiredojuruzuj.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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16664 bytes
SHA-256: a33eed291aed37a452b7dcf6d46f255eeb78ed799d7450b39980284a0fe2afc1
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 10916 bytes
SHA-256: 4b2a66ee1e3c2bbd1cb4c200e89a7246a8599b9d817316788e0e033d31199975