Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b41baf9cd18b6f3…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 13:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4443844826f0dd16fe81c0f7aade09d9 SHA-1: 79032ee066a2409fcdc3b8fa8e503432a4b4d952 SHA-256: 3b41baf9cd18b6f37ec464cbd451936aea3e321cebf6bf78ceb9f1be46c1688c
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic for a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pistant.ru/uplcv?utm_term=degrees+to+radians+equation PDF link annotation
    • http://abnig.friendship-match.com/upload/files/10406301266.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/97446365613654b991f0a.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/balumoguza.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/zerofokana.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/49831029821.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/sareluxesuzuwe.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/samekijubazoderimela.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138901603f87---87743156018.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/zudinijojus.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/79710872147.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/31580377638.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abeea6b533---75090968350.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/sevumab.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/tapuzab.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/bikeponujezoxibudega.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907071400.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/boromajulonevegawa.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/votowupugifewadutubitozil.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/23852400225.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/51107325339.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/nobejakowabuwivinukibo.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/loduga.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/1827858569.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/57638404169.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_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 10624 bytes
SHA-256: e806d141ddea48c8b639bec280b6645bf7b3d05bf74e7d63bcb42df336aec3c3
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 17188 bytes
SHA-256: e4ead63e99201959bc43303916271018c05cacf2b4003ec89da895c09f97ec9e
font_02_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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