Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec84daaa01b543f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 17:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9fd932e9e2eb125071f86480cf902b6 SHA-1: 4f3b5b2fde55de870d341787ab863c1e59aa4269 SHA-256: cec84daaa01b543f9cf41fdad1c63a1b56c37c56a1c0d0a0c89ab731042c23f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=pokemon+red+japan+rom PDF link annotation
    • https://baoholaodong24.com/userfiles/file/refetobilojiwalazef.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nopubozed.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/purobabesevowixonitowe.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/rovuzatejavetu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4446ed4f---22107391431.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/56921831332.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/23783609804.pdfIn PDF document text
    • https://atrax.hr/files/defifipojuvarujo.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/terujenobajet.pdfIn PDF document text
    • http://partnercable.com/files/suwejorinewokofekip.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/zisegokazedezuwirefis.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/39064214338.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xotetodurub.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/bugiruvutav.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/20487625042.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sixerolofetixazuwukumux.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/mawodabitamofexelodoname.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3a79d4d61efabe7df1f0f8cdc82f0eba/zelivafirarekekuroluze.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210904_C95800421691CFBF.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/67030056783.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gibugususutitomizemol.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/vozapetevebejejupo.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50914863896.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/naxenido.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/jomisamowuduroduxobativim.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/73188831595.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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 10372 bytes
SHA-256: 9df970011591fb1178de35d07e9995605dc5c65d7d292bddb21f1101f4ae6962
font_01_sfnt_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 16744 bytes
SHA-256: b37c831a437dd96dac5886708cba93d599dfee7732f80406f558290a0c97ca4b