Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c146f5a42b0e46a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 11:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cd80ddd5f26c57342b5d0b4da5fffd1 SHA-1: 0438023aa66ccd142715ad12e44213f84841c0c2 SHA-256: 0c146f5a42b0e46af591aaafe14773fba81c1c4b1c74a423577785fdeadac46a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further confirm its malicious nature, with the embedded JavaScript likely facilitating the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=block+city+wars+hack+ios PDF link annotation
    • https://gujaratisamajparis.org/upload/files/7749527917.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ac774ff6---36526242725.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xojusivibitonoxeben.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/xarusimadiramoteb.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/wawanejifeji.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b7865705a17cf1ac374cf0d75f36dba3/tapilabovurimonu.pdfIn PDF document text
    • https://kratky.eu/files/file/98096913521.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pazeropimivedofefegupaf.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/giradetukinomogezenopobi.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/potazirokarixepibus.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/jasajinanuwodinusobekuvot.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/25473848220.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/notalatajutipowuxata.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wunexibadaj.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/wovokidotuboditow.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nibisawoxikizof.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/wapufukagewebuvovo.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/4193456012.pdfIn PDF document text
    • http://huntland.hu/upload/file/38766829644.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/gawuninovugez.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16314942966738.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903215630.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/nuwowesarimevilefuz.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/23141227260.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/35862210759.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/fuladavad.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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 10436 bytes
SHA-256: c6d6ef64a6c00d53abaa019b93b757a3b3846acab5c524de3512dfd90adad1c0
font_01_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 17784 bytes
SHA-256: 486c7199332178a3da70369d6b480c10189d992503390bbdc5f16634bfdfb1fe
font_02_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1