Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f32e95c9e4cc09a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 10:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aae1a65c9ff337235e03dd994dfc90a4 SHA-1: a4add7da23ba0462a0564de858174e996eb68e87 SHA-256: 3f32e95c9e4cc09aedff5a7247a0c40ed34c6b8f65ad38f09115966a2f40de3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crysiq.ru/uplcv?utm_term=apk+download+naruto PDF link annotation
    • https://soudurelausiere.com/upload/editor/file/pizaloforawuligusomu.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/wemisinipupu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/kagovatuvuravazofifesude.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/mogejozebidamo.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-18/20210918032252532731.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/laresawexitilonedutot.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/53316366168.pdfIn PDF document text
    • https://eetravel.net/file/jokaxewenefidulowusi.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/49293109055.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/27426796822.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/xikikaximajopuk.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/81162598544.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/29909001024.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/benelusewapujulujurusuvi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/25bfbff958941864665a84d337e59b0d/92923178902.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/44450053398.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/20529319725.pdfIn PDF document text
    • https://umartravel.com/files/42141754588.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/werip.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nagajefif.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/26238539202.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109021428384448.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/87570911382.pdfIn PDF document text
    • http://insei.eu/userfiles/files/47604056375.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/96280005958.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/zazurexumugatesevemewuxin.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_off0000bdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 17340 bytes
SHA-256: bfec0428bd0f0d9f2d796c91a32dac7ac94aca03904c7cdd032f1546bb7d5234
font_02_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 10252 bytes
SHA-256: af598dc713324517736135f876223bb7bbcbe03ce64b269ded86a65155f8f23a