Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53d2e20398360ba…

MALICIOUS

PDF

89.8 KB Created: 2021-09-20 21:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efb28e82c9a005830b47ce036fc643b4 SHA-1: cb9f4eae8d0a7060e3364c21965c4a06c26b0302 SHA-256: f53d2e20398360ba96730948f324d0af984f6b7d2f01daeee9d619c150094bd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://smidgel.ru/uplcv?utm_term=alive+eng+sub+full+movie
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/99887992409.pdf
    • https://ssmavidiyar.com/public/content-images/files/30861278810.pdf
    • http://ziva-muzika.cz/files/file/xoxasekajuxipadozaraj.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368c305af6f---9568782923.pdf
    • http://mlight.cz/archiv/file/14856739256.pdf
    • https://pypconsultores.mx/userfiles/file/named.pdf
    • https://globalcircle.club/userfiles/file/98075760523.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/rivisenanepoguwaxalifige.pdf
    • https://boyanbolyarski.com/userfiles/file/mupexeronosubegagavetuda.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/21867506139.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzitifumi.pdf
    • http://mitroc.com/userfiles/file/jisugitosejos.pdf
    • https://dycmc.com/DATA/upload/files/202109090628524255.pdf
    • http://baiduvpn.com/upload/files/77702208549.pdf
    • http://etcpremium.com/userfiles/files/37669178837.pdf
    • https://topinsolventa.ro/userfiles/file/lomepufomufejedeg.pdf
    • http://huyndaicaudien.com/upload/files/25858071763.pdf
    • http://zatuchlina.cz/upload/file/sasulanisolile.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/zivabij.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/taxosegutukuj.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34648678408.pdf
    • https://akonis.ch/userfiles/files/gojogiwokata.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000f61d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16792 bytes
font_01_sfnt_off00010e34.bin
99e472bcfd32bf37182c515e0ff71d10ad5a176004f69c5456fd98cefe6c33f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 10484 bytes
font_02_sfnt_off00012608.bin
a862625ddfde31c6791516bdbae32100782d818db4324c2e8987d72b8fbd8851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 19504 bytes

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