Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20f593ba1645ca0…

MALICIOUS

PDF

62.4 KB Created: 2021-09-25 07:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc3242590468f64db638e6924546908f SHA-1: fce04ed359137cffa90b4346236fc741e737f94c SHA-256: d20f593ba1645ca0258844d73bbf993c1c8b03ec00f2cae0aaff051dd2d9d15a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and flagged as a link farm. ClamAV detection and ML classification indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5774

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://ventmetal.ru/userfiles/files/221589258.pdf In PDF document text
    • https://gangnampools.com/contents/files/10799699365.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/9898393659.pdfIn PDF document text
    • http://webursitet.org/Files/file/17719584217.pdfIn PDF document text
    • http://thecuriosityshot.com/zerufu.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/8694824859.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/sibojajesuluvipesosakalil.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/vopaxibis.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/madamarufiwape.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/87363818912.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-06-09-50-11-93.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xukutifadotafaxodudej.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/91381617959.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-19/20210919165540664453.pdfIn PDF document text
    • http://devison-matras.com/upload/file/dinokifulov.pdfIn PDF document text
    • https://yellowstonewildlife.com/62558996500.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/tusewodorijotivus.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/tovirij.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/gabebojofonu.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/rulidojetadibikosewidi.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/53588175536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=granny+in+paradise+for+androidPDF link annotation
    • 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_off0000ad85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 14756 bytes
SHA-256: 3c2e3f9cbd3d546e96a662514e2c613464fc55b7cb6b5c6e295f92b1cf3b1622

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