Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33a43204c2741e2…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 11:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94473a53756cb91726245e4ca417934a SHA-1: 2b10ed3b97e04c0ac59dbd826f5ae92c635c8f9b SHA-256: e33a43204c2741e27e373d0948c9fedcc2c956ea23bf8d499cd5bdf6fb672402
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly indicate malicious intent, likely involving directing users to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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.
  • 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://garglob.ru/uplcv?utm_term=c%23+2020+book PDF link annotation
    • http://sys-svinding.dk/userfiles/file/fozatupozosesu.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/nirakuvejupajolub.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/nufagijulimumokuzagidox.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/gozolilitosozavari.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vatarefexatuvor.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hluos0feh91h5t6cdvato1ge89/28385846552.pdfIn PDF document text
    • https://labelmarket.pl/data/file/34597411679.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/lobovajumamab.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/8954760035.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/59t8gi08063oqn9pjr51mr6va7/rolamodiwilabimij.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/13025513787.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/lawiganazotojusubuketedaz.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/45028023647.pdfIn PDF document text
    • https://matrixx.lu/images/polewokumuz.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/jogovufunefuz.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/vameromiv.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/95416665985.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/8313375584.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/ruxufewepososoritupis.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/bepojekujilizifogepakizor.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/48015802642.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/21882178067.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/lonadotozajixarajediwa.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_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 21148 bytes
SHA-256: b8c0e6b8a300535fd4af644673ab256b2198ccc0ece8e1a98fb3792187a171ca
font_02_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1