Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad67ec1d2d43a8cf…

MALICIOUS

PDF

86.8 KB Created: 2021-09-10 15:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 199f05429ac33e08d01a4022a3d8fcac SHA-1: 7e943fad3b9ae47d34cac1e641a7df2f12158788 SHA-256: ad67ec1d2d43a8cf4700ee3849b6740a5f67eeb7d5131302d1bc5df48ed60edb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a campaign to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613443ffbb6e1---xakodasaxuwipilovidiva.pdf In PDF document text
    • http://syntrend.critical.tw/upload/files/bifunapiforasupolo.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/xulowugivodaxajis.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/88550010006.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/56168287630.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/26680256291.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/zoteradejekuk.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/59531318259.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/57988946731.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/kabixifubow.pdfIn PDF document text
    • https://wasael.com/userfiles/file/3328009239.pdfIn PDF document text
    • http://holzweiss.at/55953963475.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/72326406011.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/kirukan.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/61533631993.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/38404353283.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/guzibosokomevofunexuvab.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/vibamasujiwejibujaguvumo.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210908185353100380luhee.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a9ecd655cd764e6d5cec5428de2cff9/sokele.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/zilelomibuzapi.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/54426938449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=developer+mode+pixelPDF 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_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 10188 bytes
SHA-256: 5dbc181762880aeb1da2c88bd4c8c5df84e54244bfe4cfc8f1a25548deaa0b45
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 18304 bytes
SHA-256: 751e987ac2b1289f6991669e8d31584ce7035e71d0e18ef0ba34bcc1f76fedf9
font_02_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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