Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37a74db8bf18f17…

MALICIOUS

PDF

84.7 KB Created: 2021-09-24 01:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3500e80176843e45db002c8a4cda3545 SHA-1: 41e4433f94b074fd0764105628869c5d79fdccd6 SHA-256: f37a74db8bf18f17cdf5475dec2fdea3a29b61191267543d446d6437b2ec0d10
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tekizolasyon.com/ckfinder/userfiles/files/65670768806.pdf In PDF document text
    • https://partnermind.cz/images/files/87557095956.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/kobasimafutajobenedinepu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/punivupedonuwetef.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/voluwigonenuforuwokupid.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/63312964272.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/gomuxujapaguk.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/maxakalonon.pdfIn PDF document text
    • http://kisito.com/userfiles/file/76538650097.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/peketa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/53652221314.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/xozetobipaxavolovebila.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/sakabirosoxoxapomomuz.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/5970402467.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/povuzunozorowanid.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/guxoxij.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/10202730543.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/26296675563.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/82625961171.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/7684981784.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a5ec5740---15486221713.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/libemedoxomarasu.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/39593579206.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/36145812492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+rarest+gun+in+warzonePDF 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_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 10580 bytes
SHA-256: e7e397d4203ffa495b089fbbce513018a6cc91286b2f19ae9b6b650f2044a496
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 17236 bytes
SHA-256: 2d6cd71d8e02e98237f4e16c647c39aea37a4eb77e453781c76f08c8611deaba
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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