Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b532034bc04f093…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 08:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9cc6a7a9507b7479190fc202aa31cb6 SHA-1: 09b77db1c2e9dd09cc2588a0af775b7dcd288617 SHA-256: 0b532034bc04f093c93e002ed2d6cd901ae91d8fa9b594b2ab45db1857fdb65a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which are hosted on disposable domains, indicating a likely attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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=grid+autosport+free+download+full+version+for+android PDF link annotation
    • http://at2apigroup3.com/contents/files/dizebitujaxafajazevolemux.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/vuponika.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/17111026543.pdfIn PDF document text
    • http://chinalabware.ru/d/files/55057400865.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/gagizusodamukevuverogate.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5fd8799d85e51f2588b4db03f6a145a1/95115276016.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/80412132328.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/1487416510.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/pefunene.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/kovojopuzutovinogodi.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/66186798244.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/fixisuwitusutivibe.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/zizakedupisoz.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/jobuvinuruja.pdfIn PDF document text
    • https://limsurdua.com/contents/files/5019616258.pdfIn PDF document text
    • https://henuopack.com/d/files/93856769334.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepulafumitafimetixej.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vejibadivoz.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/kufudinim.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/25582202039.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/76455086242.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/71dd5hem68f68bcutmf499lua2/43013543529.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/82748746146.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/nifanakiso.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_off0000bc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 16136 bytes
SHA-256: 341eecc05252e8fd0f64b16299c4b74084c828e72e056e10238bf9c38b9aace2
font_02_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 10784 bytes
SHA-256: 9821725418c9f55581975c7215dde4fe4bc928f439c76650a0eaa0a60dd8cffc

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