Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4ed0bcbf05263b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 23:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b09b5006dea6499c72fcc62e8bb5d38 SHA-1: ee5e0c3055708917d961827daaeef5bfac3b204c SHA-256: 9c4ed0bcbf05263b1f93f1c54356493271f922b8f69e65c66f023090303e2fc3
174 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external URIs, flagged by ML classifiers as malicious. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell, likely to execute a secondary payload. The presence of numerous disposable links and the overall structure point towards a phishing or malware distribution attempt, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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://jungam21.com/upfiles/file/1632210785.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143947464adb---4235616689.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/dofodewawiseliduxefaz.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/28295497048.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a851bec28---14693122043.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/videfiwilekemopipepized.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/98721806673.pdfIn PDF document text
    • http://hexindechem.com/upload/files/samutosazuku.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/makesuwevasirisesix.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/11993180914.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/megizunegefovojobisuteke.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/68345412128.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/160115033654.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/88266654221.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/40276386082.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/rosapidixigi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dufanobezegarenomes.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/45917212148.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/puguriramofijezowigefi.pdfIn PDF document text
    • https://maria-galland.ru/files/file/neneje.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/xakapupakarejube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=junooniyat+full+movie+download+torrentPDF 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_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 18412 bytes
SHA-256: 3694eaf449f368d9c57a0b96b1531dd6dc39ef4083d007318f17ad4625713269
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 10704 bytes
SHA-256: 94907c73449a0a49411dec3425cd0dada6661dc4acb213423fb88fe36a01079c