Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f6303ad0c5f265…

MALICIOUS

PDF

64.5 KB Created: 2021-09-21 08:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6abd394ba3d28fcfe664798acab7fd75 SHA-1: 8c43ec3efc91e3344bd1cd920431eb592afe7e25 SHA-256: 30f6303ad0c5f26503ac66397c274acd6a3dbdb7c6ae873d04ea915e4d577320
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6248

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=pdf+sam+basic
    • https://www.ftha.org/admin/ckfinder/userfiles/files/7040962126.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210916_061601.pdf
    • http://odpadykj.cz/UserFiles/File/61215760356.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5d61859fa4e71bd39e6704433be6a597/1982783937.pdf
    • http://nage-z.com/ckfinder/userfiles/files/turenafam.pdf
    • http://4els.ru/uploads/images/files/59588558788.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/32247d23dec6ccffc76a85e665b77ac1/tebabalopibawu.pdf
    • https://www.idd.no/ckfinder/userfiles/files/12846886902.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/jarudigurekuj.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xotozoxix.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/36567814783.pdf
    • https://bimore.vn/webroot/img/files/walanegilakovozo.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/2108308400.pdf
    • https://homeuu.biz/upload/ckeditor/pages/files/86361091296.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/pababimulepe.pdf
    • https://clifestyle.net/uploades/userfiles/file/bavifud.pdf
    • http://refpecsbelvaros.hu/kepek/files/xavojogujijegeparirer.pdf
    • http://soc-in.com/data/media/files/mitonagexivepek.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa43.bin
b94df655807d141c4188dd8d115baff9e240c44cbddfa836854ed3922a88f97d
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA43 15308 bytes
font_01_sfnt_off0000d0a0.bin
fc19683464c13e421f890e517ee24f58bada88f79c9dc5b39f9ad7862d1ac1b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 10176 bytes
font_02_sfnt_off0000e76f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 16792 bytes