Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cfc9850be74e70…

MALICIOUS

PDF

74.1 KB Created: 2021-09-12 21:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 892ca82d9c400a721d44568fab86877e SHA-1: aae9142c5f5a514679d98cd9b42fe42961a5eb79 SHA-256: 53cfc9850be74e7008bd9ca3d0f1f66d683abc8a013670df1d590225776c17c2
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially disposable domains, reinforcing the phishing or spamming nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6540

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://inwebjor.ru/uplcv?utm_term=best+android+emulator+for+low+graphics+pc PDF link annotation
    • http://broadgatecapital.com/userfiles/file/somotozenitifetaguxulegaz.pdfIn PDF document text
    • https://trystsalonri.com/images/file/vatofujeritiwulibuxit.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/furowedobujagojabulafos.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/73727246700.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210904133320.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/4399500483.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/bagazuwakuludixegi.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/86781651901.pdfIn PDF document text
    • http://northcity.rs/slike/files/42201517706.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/56707393195.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/pazolo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06518698---68973879910.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/88727383525.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ba536c15---julapowoge.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/jovotuzirapanavafubobimap.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910012733.pdfIn PDF document text
    • http://yuhongzg.com/d/files/88168948357.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/72250016648.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/delupawa.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/pufijunubigiwat.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/gopasegosov.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_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 17456 bytes
SHA-256: d173588b9f4a6f12895c38023215e0b6e97fb3c84e990af68daeeff21dc84a01

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