Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94a7e9aa080912d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 03:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6da334d4521ca37c38831115cbbf944 SHA-1: 17adb0157114d5b92fb2cade36ed7b3e18049bd0 SHA-256: e94a7e9aa080912d19e0b41ac83d2572c2ed147175df7d262dc796b986aab8fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laborke.ru/uplcv?utm_term=pes+2021+file+for+ppsspp PDF link annotation
    • http://airmon.hu/images/files/folemob.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/nelekujavejaj.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/figenovolifodusemixel.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/povosuvozadurusorulubot.pdfIn PDF document text
    • https://hobbypet.cz/files/file/samopevomumi.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nejalijejiwevalu.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/58263665385.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/jadax.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/ririmalobujodi.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/ruxepekax.pdfIn PDF document text
    • http://teraval.cz/res/file/waxinugotewinawe.pdfIn PDF document text
    • http://keitbg.com/images/files/38508133950.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/71626192700.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/38031891276.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/88345749569.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/52750784040.pdfIn PDF document text
    • https://0900107678.com/upload/file/56715335080.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/tusupugimejikazavo.pdfIn PDF document text
    • https://hinaweb.com/upload/file/52655824667.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2e30ada4---geporefeguwukerupo.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/wabufekukes.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///37391991096.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81a46803a---13910634059.pdfIn PDF document text
    • http://citranco.com/users/files/bitun.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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 10284 bytes
SHA-256: b9e8f0ac564b571c6fd0ad99adea7ea6718a96acee212c780308c318af5cbe11
font_01_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 14536 bytes
SHA-256: 8a9329e019e39585f0088b9b9873c7d05961065206f66e237d7f20d5c2d6680c
font_02_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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