Malicious PDF — malware analysis report

Static analysis result for SHA-256 763d617e3feccbf9…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 05:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee24758efb1309e0d84e89d0f1a23cd5 SHA-1: 120b05efa5b101ac5f4ca79d34106064acf03ded SHA-256: 763d617e3feccbf91624b8bc12bea66de777059bd37149f030923a655c23f388
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=recover+permanently+deleted+voicemail+android PDF link annotation
    • https://felicityokolo.com/file/dapazexenepusiriporipam.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/nefafowewovodo.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/zaginunovitubaxepama.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/67416588001.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/48bad8048f12a69fb46df8537407dcdb/81906537810.pdfIn PDF document text
    • http://drtamerturan.com/file/36331675999.pdfIn PDF document text
    • http://schokofontaenen.de/idata/81396026257.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/87969626553.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/59427154478.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/36604647615.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/gapifo.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/fesufapokitegumexuvatan.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/39604999846.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/99565314645.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/lolubozuzewefomuxovurix.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/jijawizipujas.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/11805607189.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/jirakijalobegem.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/ribokesalipaxapiwisifa.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/14850431085.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/10522677272.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/sexuwobiruwifem.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xadogipexigesuzasazojedo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f7e1db3d---nerijupetazudolasujavaj.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/fisitofagewemekotoxolis.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_off0000b531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 10732 bytes
SHA-256: 3a7297ddf4e1db4821db46e330b3cb51ae36415119fd074a8cd8221a0374c98a
font_02_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 15160 bytes
SHA-256: e99b7aef3e5fad4d847b1a4d27a78789d62bccf0ef6cad057446d523c5deba15