Malicious PDF — malware analysis report

Static analysis result for SHA-256 16879ef66336aec5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 11:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d123941c4bef478210bae2833dc4d79b SHA-1: dee0ef5e0ba54978919ef99e702654a05766c97d SHA-256: 16879ef66336aec540654b7806cac1dc1c5bc9379b962eb53ca0f68c5f8e6005
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=wwe+2k19+psp+iso+highly+compressed+download PDF link annotation
    • https://istanajp.com/contents/files/8562958265.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/67407244434.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/19642801614.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785419d166---63092648024.pdfIn PDF document text
    • http://fedime.org/imagenes/69513612002.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/sapalig.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/kewevoxewozanawa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kamexurowe.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/84492825835.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/nafoluzas.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/59844547262.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bawopudixig.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebaa6151---wesusapelek.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/wirafuvu.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/87049832292.pdfIn PDF document text
    • http://vlajamo.cz/images/file/63617216751.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/35577291384.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/88718725608.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/zajejevafikojiwenemipurud.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bibavid.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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 17812 bytes
SHA-256: 5847ff7bbef8f17451f8714c02153c2140d4d0b9a5200f8f1558372fbf25031d
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 11488 bytes
SHA-256: eab9c44e0dd44c67d6d6f585fb252adc09e85a19f58a1c66713baec0c3a52b70

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