Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b88fca7b5c433bd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 22:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b69caf0da4d0d22844d170fc223eba46 SHA-1: 5d0e2427952b8fd7fd46808d27e04220b0e9cdb5 SHA-256: 5b88fca7b5c433bde949cfc452bd3267146464771d210ccda7b3e31820ddd08b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially malicious PDF files, suggests an attempt to redirect users to malicious content or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to distribute malware or phish for information.

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 http://vanharteyoga.nl/uploads/files/satagamakagoxo.pdf In PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/tunusakubukedekotaveg.pdfIn PDF document text
    • http://ore-processing.ru/d/files/67555401450.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/99791725200.pdfIn PDF document text
    • http://poultech.net/d/files/goxebisazogunawewubezo.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109080547564117844n9h4zbtw3ca.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/legesumabopekup.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/roluzitusavakexatodar.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/20856846634.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/32186701266.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tigirabojuvu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/salunofolapigesavorinev.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/63d754ac5071356add7a0e995b5a36fc/36289972451.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/ginofolebotobon.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4509ff8f---28588898180.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/lewefotu.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/fulabebaligedawusulexobap.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sonifuwumanixazaso.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/18151745078.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/58537357582.pdfIn PDF document text
    • http://woykoff.hu/upload/file/gupuzowobapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=betensured+apk+downloadPDF 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_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 10624 bytes
SHA-256: 762ebb555ac71566d184bb047f4c51412dcdb1bb8366a51d63a6563c9cc0ad68
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 18264 bytes
SHA-256: 82ca6c22e6f81a728746c38d9a47b1e4fa5543510064381a01096c3a87301bb2
font_02_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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