Malicious PDF — malware analysis report

Static analysis result for SHA-256 14db8de94de7f7c8…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 23:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f79bed0beab6c92743006008fe38be1 SHA-1: 4af2aca7d54596719402ba40083b0ecefd9cf4c2 SHA-256: 14db8de94de7f7c844f2dc56cac78605306ffce5464ded708d84d17b5190b6e0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs were extracted, many pointing to PDF files hosted on potentially disposable domains, suggesting an attempt to distribute or redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious intent through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tradegateindia.com/userfiles/file/527204097.pdf In PDF document text
    • http://gddfboiler.com/uploads/files/wilubitamud.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/togorikejuva.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/podalotari.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/remiwaziposej.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/97503718252.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/xajivufa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m9fqtgmgksjjc65le4nks9uucf/15723761692.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/55523290616.pdfIn PDF document text
    • http://viorina-deko.com/images/file/nujide.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/juxaxu.pdfIn PDF document text
    • http://thedreams.cz/files/54439485986.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109082346419636.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/92892563568.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/39447886104.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/fibeminezalu.pdfIn PDF document text
    • http://chinalabware.es/d/files/76531217614.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02585fbcd---zafonipezeferadenavaxisu.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/jelavovinimex.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210911061830280388.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/56835810666.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/nubinosozuxaw.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/94130279193.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/febob.pdfIn PDF document text
    • http://8njl.com/userfiles/files/zosifokagaxu.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/xuvurijulovivumipisepez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hack+mod+apk+mlPDF 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_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 10064 bytes
SHA-256: 6fdcf88abf86025ec6a0f9d2a63e210c78a7ecbe6ad199a8c7aca3a810570a39
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 18240 bytes
SHA-256: 0062798cd436f01e80363928fc015b46fe355b5363d20287ad9ec4968616859c
font_02_sfnt_off000130c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1