Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5aa1f303572b74…

MALICIOUS

PDF

63.8 KB Created: 2021-09-23 02:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33dac731e4a7d8f9b8f9032f525f3153 SHA-1: 8d9f45e6985efc598ff4d7eaa2e90ead6cacdeb5 SHA-256: 1d5aa1f303572b74137ff1d04457b28dcb36a3ec5991d16d1a0b492a8c3d61de
132 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF viewers. The PDF is also flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4915789d---vinagiridabifasabezib.pdf In PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/69425031820.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/jafafefivolugutejuposov.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bofowopezozupiropaje.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/79841019521.pdfIn PDF document text
    • http://limoride.net/gallery/file/zimokatiwijejewavuwe.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/76056465231.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/43348981406.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/vudob.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/53268447388.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/98136416492.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/2998637237.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903130707.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/25900862241.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/67204309299.pdfIn PDF document text
    • http://medica-brno.com/files/48083989683.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909103449.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/28033663644.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/losexepelutejuba.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/16840295957.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///tugebaside.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/51856841538.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/88451531088.pdfIn PDF document text
    • https://botroul.be/uploads/pasokesinagapuxofajugose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chrome+incognito+desktop+shortcutPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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