Malicious PDF — malware analysis report

Static analysis result for SHA-256 879b862f1ed8e12e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 10:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0de89b8694fe352d8431b29542397913 SHA-1: a30572b15ad3006da59ef5febd3fc317ff214973 SHA-256: 879b862f1ed8e12e12ca1ec8f22a58e1cf09ede76d2d1061c4fde7ab07aa4450
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick the user into installing malicious software by posing as a necessary browser update or extension. Numerous external URLs were extracted, indicating potential download or redirection points for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=recover+contacts+from+android+to+iphone PDF link annotation
    • http://3e-machinery.ru/app/webroot/filesfiles/83980486557.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/88083230472.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/zuxotunitepefeg.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/timesede.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/tawis.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/81005474239.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/totaxajuzimukesokunavavuj.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/tulerapolekadomemem.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/mogixader.pdfIn PDF document text
    • http://baoveantam.info/upload/files/32952790872.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/juzun.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/88503555773.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/sunajufutem.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/29193508917.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137e58aea6b8---kuzipiwerum.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/fowuketam.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/20988178920.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/36048576693.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/simevabuniwurosude.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/vawarutozaki.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zapegitutovusot.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/zatil.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/77400737513.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oo9aqca4429kc9rhaj1vtn6r70/95352794790.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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 16980 bytes
SHA-256: 15e758d3f5f7012abce7b6dffa1154fee4687c18a07945b102f5b7c4991da849
font_01_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 10952 bytes
SHA-256: 6ad71d9161b61e621a1169ce1a586572b6d5cc8815f9896c50a6633fb4f84cd5