Malicious PDF — malware analysis report

Static analysis result for SHA-256 678ebcca10ca9de7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 03:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d64d550315e91f2d74da946ee63bc6f SHA-1: a872d46469b10fb3f35442e3ca40b35862ce46f4 SHA-256: 678ebcca10ca9de798b70eecd9d85132fb522ef9a6a73bbc2ef0073d0dde71ab
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The 'Clipboard command execution lure' heuristic strongly suggests the document is designed to trick the user into executing commands, likely to download and run a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://khachsan295doson.vn/namthuan/images/news/files/tiwawakeke.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/dd637b36c1be73ca868c42f88cc7de22/94440484009.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/vejagabopuxowikapa.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/tisigoxezasazisisapur.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/68613076718.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210911_9975C3177C0875B6.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tawezejakopotipulopuxexa.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/gunefomewo.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903105746.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/nofolilolowufaxorililinib.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/48965218137.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/11397487691.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/55826769323.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/namekapo.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/vobamabisujotatid.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31988157309.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/retopizewaviredafu.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/xiwerusosejuvubepazipatuf.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d9ae1cebd---feraresalemezimadimu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/8188963940.pdfIn PDF document text
    • http://stefani.cz/fck/file/keboxeseladakobitinekuk.pdfIn PDF document text
    • http://decorstore.eu/upload/file/kirikoguludafiwaluzusofis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cwm+custom+recoveryPDF 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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16960 bytes
SHA-256: 105fd0cf7a3de22f595065ed03aa57dce240c98a42feb7c933458810e05fcdf6
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 10384 bytes
SHA-256: 8b8a37a81ba38baefe8e6cb89943624e62cc290d5adf3a3c73a796d76fecb5f5
font_02_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1