Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdb62b25dbefac4…

MALICIOUS

PDF

53.6 KB Created: 2021-09-25 09:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d0ffdee43df63c82d76ba85ea926ff7 SHA-1: 633745969ce9de0383bbdebb6bdc3649fc4b10ae SHA-256: 7bdb62b25dbefac46f25a6d426f695c76bb033572aa6eaa0bafc925081cf1693
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, many pointing to disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

Heuristics 4

  • 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
  • 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://dalnoboy.org/data/filestorage/upload/files/72011078920.pdf
    • https://nicklason.se/ckfinder/userfiles/files/25090011036.pdf
    • http://paraglider24.de/pics/fotos/1/file/91963557384.pdf
    • http://posicert.com/upload_fck/file/2021-9-12/20210912020106933186.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/sodapokinumabilupumavesat.pdf
    • https://sassanoproperties.com/FCKeditor/file/78088073742.pdf
    • http://codienlanhminhquang.com/upload/files/19759316273.pdf
    • http://vntattoosupply.net/uploads/image/files/tivezaxosavunafuxijisaten.pdf
    • https://www.paseppe.gr/ckfinder/userfiles/files/duvaleremoton.pdf
    • https://edenestates.com/ckfinder/userfiles/files/25706059783.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/75399298538.pdf
    • http://huerural.com/uploads/image/files/lonutemakewukifo.pdf
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/komopenita.pdf
    • http://cncsprings.com/d/files/20887507546.pdf
    • http://forter.vn/hinhanh/file/vuxexepamobozigukinunaden.pdf
    • https://kham.vn/userfiles/file/73305016189.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1d3f2b1b4827dfc1e3db2a8fe482958f/tigiv.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/gebuvifudibu.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/doweboz.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfcb759a---32316855975.pdf
    • https://behagi.eus/files/galeria/files/pefinerezigetodalinezimep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=emoji+switcher+root+apk+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000affc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 16792 bytes