Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6e3199a89b6fcb…

MALICIOUS

PDF

88.1 KB Created: 2021-09-15 12:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f9e5f020e6194280df4aeb7242e2ad3 SHA-1: 9bfee1f3c10ea7fafc621599e05512ab4b051432 SHA-256: 6c6e3199a89b6fcb69ce34e1aa92b398654d51ce4d62e250963bda19514767ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://medvor.ru/uplcv?utm_term=justice+league+telugu+dubbed+movie+download PDF link annotation
    • http://everest-c.ru/ckfinder/userfiles/files/95287305912.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/gopurobopeligajesufelevu.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/18501078682.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/kadidobijazoj.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/5796469519.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/mofuw.pdfIn PDF document text
    • http://sparkpro.lv/content/file/notarulugavololiwibatis.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/falikawizibiw.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/64416007864.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/50226605134.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-15-14-11-53-68.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/4175530414.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417acbdbbdd---vuwufosubob.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/kumiwegeripesikumidu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136f72c1ed43---tonupezutozip.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/vumefirakezujot.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210907215826-tukutij.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/guzalowoxegilekofe.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/20663189947.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/basikom.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/60216563076.pdfIn PDF document text
    • https://italvaping.com/file/kenug.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/72011078920.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/88052624354.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_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 19648 bytes
SHA-256: 8353f67636f5dd5de16c882867ca45cbf7ee98f519b41a9bcd6b1e386f58fdac
font_01_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 10996 bytes
SHA-256: 87017b6e70e7a6a54cebfd2687c8a27e963ab4eacc5b9956573f3791c656018c