Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ceb68bf0b8c98b1…

MALICIOUS

PDF

67.8 KB Created: 2021-09-24 15:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1490bb308f5b82b65088638154154d7 SHA-1: 989387abe74e9e91fa77e8b5817cbf9cf76c5e92 SHA-256: 5ceb68bf0b8c98b1fa863f5db2a2498bf45adc94f1f391dd4916fe0d70977d99
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ClamAV detection and the presence of multiple embedded URLs strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to a second-stage download or a phishing page.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3938

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://irlanc.ru/uplcv?utm_term=kinemaster+pro+for+windows+10+64+bit
    • http://cancercareresearch.com/userfiles/file/65600119269.pdf
    • https://schmitz.cz/res/file/jodufa.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141e08d8338b---xojewelaxegilamibix.pdf
    • https://hotellemaritime.com/hotel/upload/files/regexufapitapiwogokujiga.pdf
    • http://industrialdevices.in/uploads/1058162677.pdf
    • https://atlanticcompact.org/userfiles/files/tejixedagise.pdf
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630883975_60f4bd8507.pdf
    • http://ilksolar.com/Images/Media/files/nomorisume.pdf
    • https://sokole-tps.pl/userfiles/file/wisunidapatakekigipegi.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/90352917598.pdf
    • http://erictex.com/ufiles/files/58018443678.pdf
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/38065086598.pdf
    • http://jamalcar.com/userfiles/file/vikujijikaganoxisogek.pdf
    • http://brcassociati.com/userfiles/files/83558523847.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/komolugevapobizamix.pdf
    • https://alpinashop.rudy-ra.com/files/42756308586.pdf
    • https://total-sport.pl/img/upload/files/zimugobupo.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45859330092.pdf
    • http://ranchobg.com/img/file/92089815681.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48bae80caad5d0fb1d98c59113a94f8b/45932919138.pdf
    • https://stka.gr/ckfinder/userfiles/files/bubinezebuvu.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/kaputaka.pdf
    • http://antichigelsi.it/userfiles/files/64059667233.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83908082529.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_off0000b08e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB08E 16792 bytes
font_01_sfnt_off0000c8a0.bin
bf32ab17abc6b88bbcd2e8d408ea7a920b27e3e00d393db62b1f808169adf78c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A0 17128 bytes
font_02_sfnt_off0000f455.bin
2d32c39f8eb76330cd22c6c583d3a46037a37ba76e57fc3976269631c1c9b36b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 11248 bytes