Malicious PDF — malware analysis report

Static analysis result for SHA-256 188dd4ed59a90706…

MALICIOUS

PDF

95.6 KB Created: 2021-09-18 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d3d42709d51b00f0e309e95e83e576c SHA-1: df90ef536bdab2347cc6d1fa266fd0dea434a50f SHA-256: 188dd4ed59a90706176190ae9669cd0b6ae64588519bf5cd145a57008b98706f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains. Heuristics indicate it functions as a link farm, likely intended to lure users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ceramvetro.net/userfiles/file/92200945172.pdf In PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/49840604478.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091811174270554.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fuxirebefaxulog.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/duzup.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/53755005053.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5ddce8f1---41956442273.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/9501921825.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/69326339522.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/99704833191.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/1290977421.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/golupumidolojap.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/9671756642.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/53323834506.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/fugubawu.pdfIn PDF document text
    • https://bem-sa.com/img/file/mozujaxofizatasevel.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/zatesozakopel.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/38049818072.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/zogosorifok.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/vobububanifuwezo.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/26553972701.pdfIn PDF document text
    • http://netflor.pl/upload/File/bujogixuzozikupalageli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+adam+and+paul+full+moviePDF 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_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 17992 bytes
SHA-256: 9fdde2fc372e07958b6792549de6b05ea97df954299d3aa77ab4f5538c1832a9
font_01_sfnt_off0001403c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403C 10776 bytes
SHA-256: ab2801cd41a076f84dc72e0dce75ce087cdfa671346a0ce30b4d8ca7d8c31ad6
font_02_sfnt_off000158e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1