Malicious PDF — malware analysis report

Static analysis result for SHA-256 7629e9b094b2bb73…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 00:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 102443e152137d07904b5afa899bbde0 SHA-1: 519b7656915b6418c0d6d6df9530c2fb6a4bb666 SHA-256: 7629e9b094b2bb736f5c222b7d48a95118ef863a9945fedd7745560e4ad39c1f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=sport+live+streaming+android PDF link annotation
    • http://bookblog.kr/data/file/files/pijurofivowegexaxetovi.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/65187343412.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexesazixikepogaw.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/67256419855.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83373337483.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/95460963609.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/89959310046.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/1215743049.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd6eb9113---64018146147.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/pezonilupomewekax.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/dexitetiv.pdfIn PDF document text
    • https://rintrans.com/files/tevizoserevojumokobe.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kakur.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/ninupowe.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/tukutipamovi.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/bazomilozexirepuk.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zidabajafijajurixutiw.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/01d4d1fd6c165fe0bb066a9331aee998/25596179804.pdfIn PDF document text
    • http://hotechike.com/files/files/60810403033.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/23656519998.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/pijabidomugodipenagupuguf.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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 17232 bytes
SHA-256: 17cebbb1c47583f8dd5a8af8d13ec8f5538c8cd1f4cf9b9902393e4fda248f1c
font_01_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 10876 bytes
SHA-256: 9db4d99655ebac5e357f08d0914e63a3094936b166a08dbd279b2239d1fcf371

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