Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e89bcb2f471cb0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 01:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74e6fac01b61a9b4556a63f35174a071 SHA-1: c47b5cc42c881e012872620ccd51bb1e242022f8 SHA-256: 11e89bcb2f471cb047abfe9e52fac743026d8272761f207d2bab84cbf5c1f26e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links and is flagged by heuristics as a link farm and a browser extension installation lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading and executing malicious content, potentially via JavaScript exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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=black+mode+on+instagram
    • https://karlschool.org/uploads/files/202109060004124890.pdf
    • https://textosolutionslinguistiques.com/upload/editor/file/34405247699.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd811b846---foborifonesudetedoxed.pdf
    • http://azizavacanze.com/userfiles/files/70619969686.pdf
    • http://nyett.hk/uploads/news/files/gurutuju.pdf
    • https://nanyangtextile.com/userfiles/file/mugel.pdf
    • https://romalasergroup.com/userfiles/files/nezisuwik.pdf
    • https://asiarsolutions.com/userfiles/file/32046795074.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/91278385552.pdf
    • http://engroupe.ca/aym_image/files/72453224253.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/21497780751.pdf
    • http://testplanet.nl/uploads/files/futevazifabonifuvokot.pdf
    • http://kstarsmall.net/userfiles/file///narujawebokidapetox.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/49727863731.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/nc61ba0msrds5ln7ne1rm5iua1/litiremavepevax.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/35156917889.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/65785015945.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/65710425325.pdf
    • http://houselandia.ru/files/39583006173.pdf
    • https://eko-briketes.lv/userfiles/files/51247524270.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/85527666147.pdf
    • https://discovercefalu.com/_data/images/file/lexebozosinuvasamuxaw.pdf
    • http://fbrasil.com/userfiles/file///mabolagewifavipixagid.pdf
    • http://dade666.com/userfiles/202109file/2021090920201470554.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e467.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 16792 bytes
font_01_sfnt_off0000fc79.bin
0a50c6e3394c80cbb5bc25fafa532072f1c359f3050f5f9cc9fa986c9f1e91ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 18320 bytes
font_02_sfnt_off00012bac.bin
b78819bccce1e8e6414cbe46abd6da092bdc512d2922c034d54ca6ce085f6d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10856 bytes

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