Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2081e5e31f8e2e…

MALICIOUS

PDF

80.4 KB Created: 2021-10-07 03:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69174262b752c87acda102830751c238 SHA-1: 7cc7c4f0535a29196e858809d32af53b1109762b SHA-256: 6b2081e5e31f8e2e0ed6b1b3a09517b573efcb54ef7d75ddbb422484b8ca7d11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable hosting, suggesting an attempt to obscure the true destination or spread malicious content across many domains. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://episcopiaoradiei.ro/files/lerowa.pdf In PDF document text
    • https://dogathermalhotel.com/resimler/files/foted.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/navoxefukux.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/74752723476.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/wazekalu.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zujiselalubamo.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630554338.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/guzosumalupozevokopegazu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57597295189.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/paxipirumurezixirab.pdfIn PDF document text
    • http://identik.hu/editor_up/galovipapikinirevike.pdfIn PDF document text
    • http://ping-property.com/user_img/files/vodakadobulifunotukerob.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/95924523377.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/81486260081.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/17823041437.pdfIn PDF document text
    • http://telecycling.info/files/file/28049342978.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/34534860829.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/muwetoxapunuz.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/77511487392.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a27c0cfd---zatabirazejesugagutepipam.pdfIn PDF document text
    • http://financesnadno.cz/upload/file/tufulopexotovenolenina.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/kidubufegopo.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/xamipedebuxuvesoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=black+discoloration+around+mouthPDF 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 10748 bytes
SHA-256: c89ebec8e7c6deeda136f1392e7828f62de2dbdadc1fcd7b7354140f39e1757e
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 18164 bytes
SHA-256: 5cce9c899c6d785cb5583e9eb5faf7202e414ffef1e0ecbc687cda330f46418e
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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