Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3aefda4e1de2c2c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 09:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 230db0b0e4b4c886f76b612b99cf28e3 SHA-1: 2fc16a2aa9adbaea92ffc3e58c191bf24a8d0b3f SHA-256: e3aefda4e1de2c2c4d92ba1cafac8f8244574e0940f09317769da949eb6623a2
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It employs social engineering tactics, specifically a 'ClickFix' lure, by instructing the user to execute commands via Win+R or a terminal. This technique aims to bypass security measures by tricking the user into running malicious code. The document also contains numerous external URLs, suggesting it may be part of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=borrar+archivos+log+android PDF link annotation
    • http://lignumweb.com/site/webroot/uploads/files/36019753847.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bifomidizaxe.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/93726891437.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/dibusubivifatab.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38223496050.pdfIn PDF document text
    • https://gilbertems.com/videos/file/welikotuwuwofu.pdfIn PDF document text
    • https://profesa.net/userFilesfile/mijezilowovuvupudu.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/vevavikipolebetes.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614320f5c6b51---42924202087.pdfIn PDF document text
    • http://grandfiltr.com/files/file/96617460429.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/gexoves.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/40054189350.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/28599894948.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/8079894529.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/raxulikiteloronanez.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ce823f4f---besuxovikizigewuwodive.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/37608863714.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/20608186032.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/95525457429.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/66616961257.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/pizubef.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1048cde0d2ee168014ca0026fdedd462/34894937726.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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 10536 bytes
SHA-256: 1f163b74cda809a8ad168baeadc508da05373548e4c8059c5f36f9f03a907c74
font_02_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 20648 bytes
SHA-256: 3e3fb619356f7957754567ca193dcd25749b69c357c5640af17dbb1706456890