Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f453b9026a0bf5e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 23:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca58e0c77d27d198d07c6f97bbc41444 SHA-1: f8d9487349ede156c6c1e1531b67ca45de4dc246 SHA-256: 0f453b9026a0bf5e2a0ea17d0ac3cb125425d9febe839b82ce97c89f167a356d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious PDF files. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document's content is designed to trick users into installing remote support tools, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://novo-foto.ru/ckfinder/userfiles/files/35804856879.pdf In PDF document text
    • http://yuanhebiotech.com/upload/files/remezidelasus.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/18226547200.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/xudisidotizobukaz.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/41934320708.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/60727547649.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/87952828823.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/91741245842.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141399d23866---54271746975.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/rupasakekiv.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/dumonum.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210905074617.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9b8a330---14267925698.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/35822241422.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nalawisiva.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108f639e0---sokifumatavig.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/22495735811.pdfIn PDF document text
    • https://buka.ru/sadm_files/gabubijejebugegusogijawoj.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/49184939095.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/nujinowezamusa.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/95344126176.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/bebolirolakowonivow.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/39061948175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+to+computer+screen+sharingPDF 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 10996 bytes
SHA-256: c0930dd92211176cc0a7b4e40b8f650ce6ac6b65e66ee8cd1345fe3a90f0dd38
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 18556 bytes
SHA-256: 4177bd96b13c230ebf31ce7e7296d99188ccfb54622b71fee85bd59d4df77cb6