Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef04d1eaca72be88…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 02:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2a6fc4735a8240683160d2a787c0aaa SHA-1: 9a4045d9a18da3d3324ceb17f119a6914e9b3f5e SHA-256: ef04d1eaca72be880284c6bb47d140f01bb9003eeaa17ddad647b2ab12df35da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior. No scripts were extracted, but the presence of numerous external URIs points to the document's intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=how+to+make+a+group+call+on+android PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/405c2a7f5ab91625362b2bf4793ce82f/24855809546.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/98611538952.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/dekodegijowolazu.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/nezadilololo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/piguz.pdfIn PDF document text
    • http://epplast.com/files/file/87984802607.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/85365963118.pdfIn PDF document text
    • https://network-italia.it/file/fefalivexibafoporuzaruv.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/tamipuzigiforiwubiwado.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/sevesipuxotifafezap.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/vedipegawudazovoregiso.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/92442815541.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/funofixoxoxi.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/kuzelepepa.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/zesuwifigumur.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/nadupafozeti.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/13443375972.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/34612695072.pdfIn PDF document text
    • http://labsshop.com/d/files/53145454225.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/wozonuli.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_off0000aa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5A 15200 bytes
SHA-256: aa9444474a2c465e7f1e55eeea02f9c1ad113b14289a76024b9600d6ae7238c0
font_01_sfnt_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 10956 bytes
SHA-256: dd9759023d2f07be2905b4e50fd0bf347e4a2438a9a4e23ac8d463c61da51bce

Open this report in the interactive analyzer, or submit your own file for analysis.