Malicious PDF — malware analysis report

Static analysis result for SHA-256 914ab2b1613a14fa…

MALICIOUS

PDF

77.7 KB Created: 2021-10-11 12:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4dffce114136d518101302f14d89c91 SHA-1: 1794c059b9eec392df3692c6e24dfa1d8d262be3 SHA-256: 914ab2b1613a14fafd651e7b298e81c924843ea7ff7c63523b6b7375dc64b239
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://asiantms.com/ckfinder/userfiles/files/rumovo.pdf In PDF document text
    • https://pomtco.com/technical/files/file/30363299372.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/24228910838.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090702181673499.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/matukabol.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/66603969942.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/99436830710.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/35754946448.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/83525672422.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/xupuwopusokigopowas.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/93883162378.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/26201948160.pdfIn PDF document text
    • https://siroyensao.com/upload/files/xuwixubupizupatimaxaw.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/25142236155.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/tazijedawitinakutapof.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/debigakejozurawigifebita.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/76139883413.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/subopexisuw.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/36121270563.pdfIn PDF document text
    • http://trubaopt.ru/content/file/10324223697.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/gexal.pdfIn PDF document text
    • https://keongracun.org/contents/files/11145624444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=clinical+psychology+what+is+itPDF 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_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 10652 bytes
SHA-256: 6f9f71fae2311ecdc34ec1016c3e6950145742d7f417acb545af2d984c468d1a
font_02_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 16692 bytes
SHA-256: d506ecabe3b0da72ea44ad0372fc47f1e1ce223282158e2d0e19f12280e2eff2

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