Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedad97037977351…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 04:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9dec98986050d99be66ab38164f20515 SHA-1: b8c6ca3d077fe059351ad2d6e119254e80f0b156 SHA-256: bedad970379773515222477c3e6dbce16aa9e83fc2001bdd462c1c93820db3a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous external URIs, with one pointing to a PDF hosted on a disposable domain, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/wibogetikigevuzog.pdf In PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/vepeduxe.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/49539954340.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/pavewijuxedikow.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/dabesetuzudib.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/wamekogitemadirenasevo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/nudusikiduvanuzezoned.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/winogizamogededeboginotiw.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/73411843799.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/14111357003.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/popekilo.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/77197736844.pdfIn PDF document text
    • http://palami.by/images/file/gizidav.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/86877894801.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/32027597584.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/60801868992.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/11973052043.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/57696571395.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161316fca65ffa---finaxu.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/80134462752.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910131658.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/totew.pdfIn PDF document text
    • http://unibox.lv/files/text/27690320132.pdfIn PDF document text
    • https://bachson.net/upload/file/rudepador.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/48456196873.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jorokapafuzakefup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=call+recorder+mi+phonePDF 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_off0000b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 16616 bytes
SHA-256: cdcceb065695d6c022df96e462b288cd2bd87d13793cfd03b32d1e344aaa2290
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10544 bytes
SHA-256: 09f9d47776385b4ff74384e71d74a220c58812a6926b068841436842adc8b93e