Malicious PDF — malware analysis report

Static analysis result for SHA-256 790023bedc4a00f2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 06:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa77671efcda46ae04e19be5408c73f8 SHA-1: 2b86ee1f666fd6c4fd0f8f65df92d8917c7a4854 SHA-256: 790023bedc4a00f2ec695223ba5648eda5043c32f77ddab7252c08015eb9b59d
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=best+mid+range+phone+2020+antutu PDF link annotation
    • https://samsungklima.net/upload/ckfinder/files/vipime.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/bokifenupasur.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/jugazofatak.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/72348644083.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/julexabigabamilulajo.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/gisaranu.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/2911408176.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/furilabovijaviremelagi.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/TuqDJHOe5ZRk.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/lebemokoxodatewaruva.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/31105211537.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/69844254525.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/jepigujinibizasepivuzi.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/degowefevurikumafelamu.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/76989218022.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/29050748841.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/fatupixofaxuwakezob.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/j573hhild3vb3uc9bftrk8emq2/wifelidatuwevogogon.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/biwalelawate.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/52457081311.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/rovutonetasigalijowuw.pdfIn PDF document text
    • http://exim5.hu/_user/file/jerikijudamagodudurid.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145532ed86fa---simekuxi.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/zererab.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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 17116 bytes
SHA-256: cb17c1217c73634edf5f6e23f71eb604c095bb7db915bbd6fc22505018c9c086
font_02_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 11188 bytes
SHA-256: aab1c5a7d48d7b02bcf98170bbbb2682050ff3d08f84c86a124f84a8df0f3699