Malicious PDF — malware analysis report

Static analysis result for SHA-256 4331653f2895c080…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 16:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cdd3b875b7ea823fa33ca23e438d103 SHA-1: 39a1d4fba0c92ac3b914aa24a792e24f3b739d80 SHA-256: 4331653f2895c080b4cf539b74fa9959139ae934c3e77761817a4e7e89f48bf0
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URLs, suggesting it is designed to lure users into executing commands. The 'ClickFix' heuristic indicates the document likely instructs the user to press Win+R or paste a command into a terminal, a common tactic to bypass macro restrictions and initiate further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • 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://philabc.ru/uplcv?utm_term=windows+boot+manager+ubuntu PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16142c276839b4---tanigu.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/zuxufemiwixigulul.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/30574044861.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce0f94fd4---91447251295.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/77051205531.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/6703961448.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/49827638629.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/217742102.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/funeromovonoxoxafive.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/pokemitivuziz.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/67516149535.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/tegufomujudomonem.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/galosabe.pdfIn PDF document text
    • https://songhong.info/userfiles/file/xijibudoxelefagaxono.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/93837086149.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/50099917680.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/jekow.pdfIn PDF document text
    • http://bndweb.nl/upload/files/wenumutadobad.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fapetilevivifelizabur.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/53405218596.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gutitabubu.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/57025504257.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/vibiwarabo.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/tomizidagum.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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 10864 bytes
SHA-256: 057241dad2844a45dcc48a6feabf9d4b1ec03e0bcf3a65d5159f6c3ce7db1e27
font_02_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 20288 bytes
SHA-256: 494f1c351ebca11c6b1ef3ea2009efad8518981f79cbb41724b87ee0a6c7d484

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