Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e8433ebf0e9073…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 18:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2335cdde1e3a0b7e26a2aec307dd57eb SHA-1: f131f569562a582992c5c495808c2e6c7b689589 SHA-256: 52e8433ebf0e90733cfc49839168e84041c224a86d72eca4bccddfb5ee1bece4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=xnspy+premium+apk PDF link annotation
    • http://dhleisure.com/ckupload/files/32562961404.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305d5ea064e---38437403716.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/77158869404.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/zunutisalim.pdfIn PDF document text
    • http://acelybio.com/upload/files/wudonu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/kexopuwanalab.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/goxujexubadipizojewo.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/8774380538.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/polizot.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/butixudegasasul.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/67795106529.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bb33a4f4ca2d156af125ed9e4b7fa3d7/gakuxebodone.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/88220942367.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/duxotavujojevunixelex.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/99160423204.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/63253373859.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/71887046374.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/80169367489.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/lukexasoxonuwilotege.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/tofawaribuzosir.pdfIn PDF document text
    • 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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 17408 bytes
SHA-256: 7234d194e1c3f316b16103160dead5d1df978d1d7eaa6c0dbfdbb91044921fa3
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 10464 bytes
SHA-256: 12711992f0a81dc7b1292ab4890d9673439e7a0fb3371025bd43452a092800cf

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