Malicious PDF — malware analysis report

Static analysis result for SHA-256 4532be5d78094205…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 00:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ffc1089f23a532f5549dba5a43263b59 SHA-1: 89c0d0a83df955749507ccd9aa511dcb58a7626b SHA-256: 4532be5d7809420502da77a5d758364f33459efbc63c9790ab91cf49b4396ed8
132 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF likely exploits a vulnerability or uses social engineering to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://krisoc.ru/uplcv?utm_term=sword+art+online+season+2+ep+16 PDF link annotation
    • http://weiken-rc.com/upload/files/lupimebuwijeburopuviralex.pdfIn PDF document text
    • http://masonhn.com/d/files/97632331058.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wexojuleg.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/titivikubotetebokevagavom.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nimutigegupekuvetetiva.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/64691042606.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/26648803643.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/50427817198.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/lelaferavubogewosevabepe.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/86503089842.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/30702750911.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/detoradabegemevesesujoli.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/jezitifupodepelof.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/sezuvetitaxofuzufideruga.pdfIn PDF document text
    • https://rm-parketi.si/uploads/mofevesoxino.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/nexobavuzexulil.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/bapipatemabewarokataru.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20167047758.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/83801903296.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/zunawa.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kedasipigeni.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC113 21172 bytes
SHA-256: 399c24f04db6f0fdee8509c1c2e152172badff96a32cd8b4d35868608f1e047b
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1