Malicious PDF — malware analysis report

Static analysis result for SHA-256 295a6b91ee7eb73a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 18:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f05ba29349d625580bced5226eddde0 SHA-1: b683a4456b9ae88ecaa533aa6f277e54ec034140 SHA-256: 295a6b91ee7eb73a0972617987b79cb273b11e122c6f543ba5cea9b8eef07487
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social-engineering tactic. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a846578---51902485137.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/638a7325555f5a6111922da5d5a8a6a7/83437707273.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/153603360861357d74042fe.pdfIn PDF document text
    • https://lesura.net/userfiles/file/2600069576.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/70395075155.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/mawupim.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///87052454987.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/31239934316.pdfIn PDF document text
    • http://clerus.hu/files/file/rivenabinopejulewomob.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/52055438533.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/37746173839.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/vugokava.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/walitiwefulixebiwosepasim.pdfIn PDF document text
    • http://01host.ru/userfiles/files/8967084487.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/59382347956.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/86734726535.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/rolunidagibonalalukove.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/8887720877.pdfIn PDF document text
    • http://stefani.cz/fck/file/dafegapefugogimikedi.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/2621616340.pdfIn PDF document text
    • https://pepsima.biz/files/file/684554735.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/47983673780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+set+sms+notification+on+androidPDF 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_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 17436 bytes
SHA-256: 4449028df92a271958712247d8b70b328117a7aa631ed2dff9d5a637826a45c9
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 10668 bytes
SHA-256: 2a84421cbeddfb09f9bb1bf839b6f9dacea9b61db0ec7094ad5cd057a46bbcd7
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1