Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df015ca2bb2c1b6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 13:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb20c052df51837418b9dd9a123fb0d9 SHA-1: da3481bfa302be2ccfd39397f010608dedea2a66 SHA-256: 4df015ca2bb2c1b68531d8f15d3aa373d53faceff88dab41d1655f438f6bbdfb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catamma.ru/uplcv?utm_term=sea+of+thieves+apk+obb+download+android PDF link annotation
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/63528249714.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/25181721138.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/gepakutatalivujixaja.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/likosufokupemovorup.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/91529534420.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/romosub.pdfIn PDF document text
    • http://jawarakreasi.com/file/96642550497.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/dozipedepulusobukukusul.pdfIn PDF document text
    • http://ux-school.ru/files/files/42179242190.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jenusefiluwow.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/19467211656.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/7913085993.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/38146846347.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/26817210925.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/54007446192.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3d90d195---48732626236.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/43983696241.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/jekowat.pdfIn PDF document text
    • https://kar360.com/resimler/files/mimovoveba.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/54873715652.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 16464 bytes
SHA-256: f31177e7c21986672bfd127f06d50afd0d1fa00480c564e2fe56e0f0b30170b2
font_01_sfnt_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 18012 bytes
SHA-256: a089b629202ef0263f349e22a3e7edeb887fde33d86478bff7e34a58d9a211ba
font_02_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 11056 bytes
SHA-256: 09efddf7cd3d3d98f539aa2992cd2f2131f6075e5012894629526c6138e0a23e

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