Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf09e50be0514cc5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 19:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cb7182a725974e1fd203c2a59872d97 SHA-1: e1cb87b1b73a563d1ed5efc89c5acbe26cea5468 SHA-256: cf09e50be0514cc5f0a8aa2e963558578350e713dd3e37e5da1935fce44b6c8f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ML classifiers as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct links on disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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 http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135de0406593---xuzewibuseboxidalexuram.pdf In PDF document text
    • http://homeopathyhongkong.org/files/fokuvonufutujuf.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/22784019132.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/91558467996.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/54123583054.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/futike.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/57884767865.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/71357330784.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7abd7089385d8ce536c61d627817ade/jiwupinugilodijatimiwi.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/fopiv.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/zemuzi.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/sugitedefefid.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/40276487032.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/90187082166.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/36697336951.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lefapisifetamonufojiwit.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/69204072392.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/97108724674.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/desobofapilatozowewagavos.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/wemibozagesijamitibevaro.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/83799954571.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/6890891586.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tiposuvuxabimamugoleri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+5am+club+pdfPDF link annotation
    • 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_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 16784 bytes
SHA-256: d1e3af6350262357c8adc11270e99578f5bd88f7846ab86631f25644969f19d3
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 10540 bytes
SHA-256: 74e414991f5ac2eb3b8b7fb44cc08be747c740d56fc01f622fa48890dade7f9d

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