Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6d1ee26e727398…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 12:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aad5286c3e459f7a921c96891071854b SHA-1: 7a3ed1494dcbba4c0da5724fb9b62d46725163e5 SHA-256: ee6d1ee26e7273984a6608ce10c71f2dccba80cdd8c616103bc56253a84bbfb2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination of the links. The embedded JavaScript likely serves to further obfuscate or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=czardas+violin+sheet+music PDF link annotation
    • http://www.mediagrand.hu/data/editorfile/bedojesexiv.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/mejofel.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/wenovipozaxakebigisugidib.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/kokofib.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/savezinopozosogaw.pdfIn PDF document text
    • http://alkanboya.com/files/file///48167604358.pdfIn PDF document text
    • http://willbramephotography.com/lavavodimewonekabaruw.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/46985816467.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/81366018911.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/67813212457.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/22621775308.pdfIn PDF document text
    • https://dintek.eu/uploads/file/wemirimibupijamanesopenab.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/61989660592.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99bec7854---42586389652.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/402308143.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/60419351800.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/78253751669.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130811514d73---bulidedosebotidujaj.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/33197477149.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/65414858841.pdfIn PDF document text
    • http://pbpharm.com/upload/files/88643619757.pdfIn PDF document text
    • http://ranchobg.com/img/file/lomogunaxawimojir.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/nejujamamito.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/35871747106.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/39730354404.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/diwebobagezivugijax.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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 10892 bytes
SHA-256: 3cafc63f2256946d9c5d1fcc79f16985171dbf4a7d6eb9fccf9fe4ed7e517e6a
font_02_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 18164 bytes
SHA-256: 513be4069be8597a8c448649bdf2d9b65d2fe12e1aa731b35f584c1c184db129