Malicious PDF — malware analysis report

Static analysis result for SHA-256 91463b9e4476d254…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 01:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84d47a581c4bc9736c2cd42d89585646 SHA-1: e8a66bfb90994855d1150a3f5dacfbbb1dbcb028 SHA-256: 91463b9e4476d2544b2bcc760d923b20890297535a9b2ead46e61506205c05bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the extensive link farm suggests a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=yuvaratna+kannada+movie+online PDF link annotation
    • http://machinegroup.ru/img/outer/files/xebaragejadufifojebobago.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/todobimiviraxugegodo.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/98593229729.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/39458939667.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/kotikaxezinopo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fd730929f---vizegebuxoxivudogunuf.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/terokusovaz.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/raretutajapeperifejidig.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210901224913.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/lepajefizazumikawuto.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/firutedaruloku.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/58833084714.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/nezinokafidakiret.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/5086518479.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/dizimiwego.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/piraluloravus.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/22117594453.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/9287202626.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/litukerexisaxo.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/nuxameluri.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/4410549932.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/papewedenis.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 10484 bytes
SHA-256: a2fc369a8cba4a3521e9d54f2e607521956e7d28db188c2e59b9f16bd65bd5e6
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 17840 bytes
SHA-256: 0f59754078d75722ca15893998dbb73f8a9fd83bfbc33e907bc92f01f05a9336
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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