Malicious PDF — malware analysis report

Static analysis result for SHA-256 482b56bb46a7445f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 04:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 311fd2f36c6c178eff603d03cfe8907a SHA-1: 6df3348d363cad4960a31c4f6bdd261de1bd2ce2 SHA-256: 482b56bb46a7445f2c9bdc000458b54e6c94fcc3da09fba29273ed9aa6f034df
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a clipboard command execution lure, indicating an attempt to trick the user into running malicious commands. The document body is heavily obfuscated and unreadable, but the presence of these elements strongly suggests a phishing or malware delivery attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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 http://choinka4x4.org/cms/files/file/26382267215.pdf In PDF document text
    • https://maviet.vn/upload/files/ziviru.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/46889549860.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/lasusowusoxomolajoxowafox.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/xutos.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/lunose.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/21361991154.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/31789688188.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r6v4n5r1a84nq6mlljb6u2lt36/19814906937.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/pazuvutatefotirefuve.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/nilixopowuzuwo.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/19776141423.pdfIn PDF document text
    • https://afma.pt/site/upload/file/popozenojorida.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/32499209590.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/90508874955.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/93146110115.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109181826075175.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173deef63e---46052481563.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/sozetujof.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/66620967337.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dorefeba.pdfIn PDF document text
    • http://a-pluset.com/userfiles/gojesefakelazabevexiw.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/sewibanutebaredikawexa.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/bejewuvogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=shaolin+kung+fu+pdfPDF link annotation
    • 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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10544 bytes
SHA-256: 3a00dc53e77dd7dcd9f2ad53246677ef41bc0e028f0d628f6e6d343d6787a286
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 18128 bytes
SHA-256: 153326662d8a36a4bda5cbb8db2c0775ae43df4c7ca16636b340f73b0bd7fe70
font_02_sfnt_off00013383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1