Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd13d43ef03a21f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 21:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ea357630c2698528e44f8ad98f04c68 SHA-1: e360c488711f26cf7ab4c60a454e7d415d656025 SHA-256: bbd13d43ef03a21f4af2d70451cd96aff44d4b53814f4589d730aa0630cb7186
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to host phishing content or facilitate malware downloads. The embedded JavaScript is likely used to obfuscate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sangolongphuong.vn/longphuong/news/files/11922108443.pdf In PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/64964149118.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tesipon.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/kaxizalu.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109090428356107.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/jezuvudikixim.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/pepezimizemana.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/98768400972.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/sokexugujifim.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/mudusa.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/tavalibikoxesarid.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/75705084885.pdfIn PDF document text
    • https://theurbanthinktank.com/files/gilutobufijozatixopugut.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/58224601054.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/24528436658.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41432602707.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/15131949059.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/34520496989.pdfIn PDF document text
    • https://purefeeling8.com/data/file/xorijilefudufililumu.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/xupuzosugepagomogo.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/tiginumidepixurabix.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/34147263677.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016fded905---zuxoneludugesomibejiwatap.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///zosewasazopeloviduta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=anime+prime+apk+2021PDF 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_off0000b401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 16908 bytes
SHA-256: b3443924cd5393cbec39cb3344e2b9eaa019897e8327af32344f83310399ea07
font_01_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 10348 bytes
SHA-256: 71e6c12c4170b0f5a58d64448585e088c22fa554c09bce9f6e68a40fe2f7fef7
font_02_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1