Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c32a722f12b71ab…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 22:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c8229d4127db9ab46cd95688f692b51 SHA-1: 4d4b89d0f8a9cc2b06468f106c85f52372d3ee7f SHA-256: 1c32a722f12b71ab7ab65580efc2fb326951e3ba8e80b17ed4c98a03535f553b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and a machine learning classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to download and execute a secondary payload. An embedded JavaScript stream was also detected, further supporting the execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pixomot.ru/uplcv?utm_term=android+remove+file+association PDF link annotation
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/fefalobetolokive.pdfIn PDF document text
    • http://csp.hu/editor_up/fekedixajoledebof.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/23922208626.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/58493311158.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1a2ec9a9---2172703796.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090414530273499.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/76667784468.pdfIn PDF document text
    • http://recrute.fr/files/files/daruxunakexofaxadima.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/31956732505.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/35351124658.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/lujokivanikaxe.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/69931084320.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/midelalepubotuvixibupot.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/21718605169.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/62323053561.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/mofejonarawef.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/memuna.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/diwijodazenakesosalafe.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/sofezogabok.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/88213747815.pdfIn PDF document text
    • https://avela.md/userfiles/file/94135473266.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/bejejilimuzokafuzofedone.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kumogigakid.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/83467393996.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_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 19384 bytes
SHA-256: 61ad5dca610b5c5b66610245ff46985caf97de65157ff2bc6a50ca4a4187f654
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 10684 bytes
SHA-256: 44e946aea22eb73bf88068eded6ad295df366f1b41058cb30c1a907be033dce7
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1