Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecf3e566811d922…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 22:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b02a1fbfb5ae950cb7681276d464d398 SHA-1: daf1bd2caaeaabdb4f33a582e700a4efbc51128d SHA-256: cecf3e566811d922c90fcae6cd69ee7a017b96b93669f79bae265eb0343a91a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also acts as a link farm, pointing to numerous external URLs, many of which are hosted on potentially disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript and numerous external links strongly indicates a malicious intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://faurerom.com/userfiles/file/wiwoneg.pdf In PDF document text
    • https://vpmemorial.net/images/file/potoged.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/24696054861.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8630975681.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0ddb1296---44218711661.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021917226412173.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/gubaxe.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/71750950468.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c3625011b80a4cfa860870ee24706a79/7784442752.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vuragadijex.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sitemugidelubefa.pdfIn PDF document text
    • http://warehousetraining.ie/images/36172630950.pdfIn PDF document text
    • http://houselandia.ru/files/73023724932.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/38430033776.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/5c7bfadd855592f87481f9098cc0fbbd.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/tetokezarobofanajuvese.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/luxepe.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/noriloresuwu.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/52851128566.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/fulimefipeb.pdfIn PDF document text
    • http://metall-press.ru/files/25197351957.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-1/20210901094649241508.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/rafasoredizajavoxoda.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1614370aedc4da---getamemugitanebenakemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=nonton+friends+season+7PDF 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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 18092 bytes
SHA-256: 37b9e89c122054c1338b1b17f5638cd30031faea6d2bf4e2aee6a86d44097a97
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10328 bytes
SHA-256: ed9548c4694363bdc591d1fee54ae453d155096960081d2844888a9f8d5e6195
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1