Malicious PDF — malware analysis report

Static analysis result for SHA-256 51974373d8ad79b3…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 04:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 763122bd11d111008e94b88a3189a951 SHA-1: 04b72de17877aa8bb7edb93d1ec707818a0b31c7 SHA-256: 51974373d8ad79b369b73b8c231c86b966de6e94468b46bbe20e315581e8f7e1
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The file's structure and the presence of multiple external links strongly indicate its use as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=legend+of+the+five+rings+rpg+core+rulebook+pdf PDF link annotation
    • http://solyaris.pro/admin/ckfinder/userfiles/files/85073143186.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/29764434162.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/45813795479.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/beneleronox.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/11408437162.pdfIn PDF document text
    • http://hk-keber.de/images/file/24751635204.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52930203263.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/49003785974.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/48580315774.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614530abeee29---jozofevinavusibiwizewaxis.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/84025443792.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/72516384961.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/38403484650.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/49432343065.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210901210945634.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/rabavagelagojirud.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/gedegolezotejimiminujunu.pdfIn PDF document text
    • https://latework.cz/soubory/ponojojon.pdfIn PDF document text
    • http://parfumland.sk/upl/gidawiratomurod.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/3345143870.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/324071d4130cc5653595c735624ddb86/24696489370.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/maxiwumakegoxusirapufigo.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/ruxovete.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/29396787216.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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 19132 bytes
SHA-256: 22bacc6e3a58a5a92be63706bd804cadb64bcd6e9860475daecebad72da0f850
font_01_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 11092 bytes
SHA-256: 0feb5fd311c3036dcbd417863257f0dead85dec0d879898dd46d06b589ad7c1a

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