Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0dd882c1e19439…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 16:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae93777912baa764d084fae3123c1290 SHA-1: 7e52a7625a9febcb10634d19f7767c3c2d37d030 SHA-256: 9e0dd882c1e194392967eea390155418083ed78af70870e7b5c29edebc970b51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=friv+2015+games PDF link annotation
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35920069229.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141a7ce1bbb5---wuxomudokikofusogir.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lovinonaw.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/6022395892.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/nubewula.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/58977086979.pdfIn PDF document text
    • http://schokobrunnen.com/idata/29242794976.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/50940891746.pdfIn PDF document text
    • http://zamgph.com/uploads/file/190148117351.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/suxidorata.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109282321473961.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/woxipezawegawufajamofone.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/93480407692.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/14430094460.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/sedavokuxodexazopixad.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14380090969.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/78824110573.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/tadetesi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b419b967b---93668292451.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/3005907805.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/regemigaxumuvizujaze.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/fediluli.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/42649788328.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/lotarosobulidukumulu.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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 15508 bytes
SHA-256: fbfb86f242397f6bb00e0b1d799b855af4a78dfbec280b0f5c7733e2be037826
font_01_sfnt_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10552 bytes
SHA-256: 398cb5d2a58e3ae7455512628b1be0bcd84be91c6641bc20cacffd9bbeeabb32