Malicious PDF — malware analysis report

Static analysis result for SHA-256 c607914e32f5d673…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bf51d4334c9c594d02f06bdc6f710f2 SHA-1: 391db520193b99e93b7a55bf4e5bf43bd16d13f0 SHA-256: c607914e32f5d673848cd364864968b43b800fcbbca1d0f85ebdeb4ad84e456d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing harmful software by posing as a necessary browser update or extension. The presence of numerous external URLs, many pointing to potentially disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://nakajima-ya.com/upload/save_image/files/zirebubevesixo.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130daac3689c---61756562431.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kofokumavogefomuwawada.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/veremuzebonibuxemitu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/desajo.pdfIn PDF document text
    • https://sadex.pl/fck/file/94806498745.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/nilidisexojelavotazowute.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/tijilemonegufisigunato.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/javavefukubozenedep.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/zezijagowimudibakowabib.pdfIn PDF document text
    • https://adium.ru/userfiles/file/28081728052.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/wajizariwopobesoj.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/fekobamater.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/vosurawine.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc29e4547f---27582183024.pdfIn PDF document text
    • http://packamate.com/userfiles/gepisijajebipiwuku.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/mufaxubepezenotom.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66114405330.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/14019393726.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/novesa.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/10977365792.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/gematimav.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/korid.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/burudijelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=not+getting+voicemail+notifications+iphonePDF 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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10872 bytes
SHA-256: 2c6630fbaa4e2a6420a9a0b4b5b58c358d9f1d7659354ec41b57c0b019f7f0c0
font_02_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 18076 bytes
SHA-256: dfc803e7301ef48485486e2f08b0cd687307a1eefa385b52b3a27d77c93b7ea3