Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ab686ec6547574…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 17:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f1bd8820f0699cf5cecec5c34bd41f2 SHA-1: ba9e5551d3d671662f656d24e8d0a7382fb31d4d SHA-256: 35ab686ec6547574a8a26a06d762c18d3a98609c4a78779fb3f81f6d072a53a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=fast+and+furious+8+full+movie+download+filmywap PDF link annotation
    • https://dom4m.com/userfiles/files/mupelev.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/fedaked.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zapipokuturexot.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/16704392716.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/wojot.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/konusuxixusapemawatat.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/pamupogapas.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2d0e43bd666ad7f39321355cf25c792d/fotutafidamepagopon.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/72465019041.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/53512127537.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631836888.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/33546850970.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/zejuwefasisopobof.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/34933498899.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/51427004430.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/2223861253.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/getakuwuxopoxometu.pdfIn PDF document text
    • http://erimti.com/userfiles/file/77307407491.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/40634471457.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/20120429733.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/kowejonesenugitefofilebe.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/bunimuboludapolesut.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/kuwufudulijapekusoxamapar.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_off0000b48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 16476 bytes
SHA-256: cbe3ccdac3cac3c7877d959df0df87de84502360e728a9d53928e66d258a8b7b
font_02_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 11208 bytes
SHA-256: 5b7568127b911abf9676433f8796612cc53f34653a7136e94a24d770c0c5f4c5

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