Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3755e7506eb498…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 13:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b88ff4d4c58c4a6f8f46306c84d0a0b0 SHA-1: e3bcb06708ba78476295010e4e9b6f9aef246bc0 SHA-256: ca3755e7506eb498987283a3d5a2e1c2d4ec1394b4fb89eb565d608554cf77e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many of which point to potentially malicious or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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
  • 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://goodnest.info/tctt/sites/aaa/file/fefifu.pdf In PDF document text
    • http://vektorma.ru/uploads/assets/file/lixofavejexumimerifisipim.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pojisinarowesokudazekiv.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/novovulujenabaxevuwonej.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/36369128721.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/38695356015.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/toparelifowaram.pdfIn PDF document text
    • https://anup.bo/images/files/fiwumu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd78315ff---4104534319.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/nisurameduresexilotur.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/pigatuxaridube.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/46406420857.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/miwusuvuvewikexerumemawaj.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/daxuwosewumitufet.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/60432260144.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/goxetadox.pdfIn PDF document text
    • http://trubaopt.ru/content/file/60689849131.pdfIn PDF document text
    • https://mbbs.hr/files/37029889957.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/14708059082.pdfIn PDF document text
    • https://grouptm2.com/contents/files/dipogijewekavefoduguzola.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/nadimaxobixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dosti+old+full+moviePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE1 10316 bytes
SHA-256: 7fcef86b482107f6083f067c85294c33f65766859d46eb1391787ee0d00f39d6
font_01_sfnt_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 18472 bytes
SHA-256: bcc74a5bf85472c3b83ac902ae93861e705ebc77f01fec58cdf811c030c3fb59
font_02_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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