Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1e394d00000cff…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 09:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6532f520fd7ae4d7ad666f2822800549 SHA-1: 2fc4baa7223e71b26e689b4c598a7cb546464315 SHA-256: 5c1e394d00000cff2bbacd1e9935d68e0654a8823f3118aa583539446f32bdee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a lure for downloading Minecraft. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or redirect users to phishing/malware sites. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=minecraft+android+latest+version+free+download PDF link annotation
    • https://homeuu.biz/upload/ckeditor/pages/files/wikanitifo.pdfIn PDF document text
    • https://beylikduzutabelaci.com/userfiles/file/vixizegoma.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/litaxemubovuluditutezafaw.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/80719356254.pdfIn PDF document text
    • https://flyags.com/editorResources/file///52926024762.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/55925140809.pdfIn PDF document text
    • https://grandegroup.net/files/darixosumitar.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/posutabobenafuw.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/87899491176.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/12901180716.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/zirevagunafifuki.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/samasusas.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/sokerakeradebora.pdfIn PDF document text
    • http://sbkf.org/files/files/71057233717.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2d38612db10dd697765520ecf86fa0c9/56249741233.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lonusatajakolaje.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///kifogejomujulabatuboni.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/gibeve.pdfIn PDF document text
    • https://swiz.eu/files/editor/61526127940.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/muvivaxoxuw.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/jemosogeferepefilu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/3134991267.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/telorogorojapim.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_off0000ad47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 15744 bytes
SHA-256: 8da70e483ec836b0be966876c3d039e3aecd1e2f4322abeda8d07da749f5a179
font_02_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 10612 bytes
SHA-256: 91c21cd3ab6c3abf78f1cadcc54ae18cac4ec634e602fe6a7f4d4e978da613be

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