Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea1173606b74056…

MALICIOUS

PDF

76.9 KB Created: 2021-05-20 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c9998877e1d3b05d24d836328f1e7967 SHA-1: f5796ab77387172e03e34c48e24e249a1d1db8f4 SHA-256: 2ea1173606b74056f188870d61c4b14847e82439f3c6c9492ba12889dbc20179
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+make+passive+verbs+active PDF link annotation
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/6480408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_600db41fab00a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5ff3b7c123b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_5fd96bdb84c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_6039aa1a3968e.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/98385677.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/6250439.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/rodum_kijotuzofizemam.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/a80790d.pdfIn PDF document text
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/domitof_delizirafan_danifafuf.pdfIn PDF document text
    • https://nibonitet.weebly.com/uploads/1/3/0/7/130776737/3879195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/wigazudaripuwamel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d91216-6117-424d-b5da-6dd3dbb337c4/mudezibuvutunevizuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5ac688-746a-45ad-8555-db350650891f/36732757832.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/lazefujobodafexofekaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5143cf11-3dd4-4734-9793-9ec1ecdf2d8c/senivopimidiwape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65179ca6-80cb-41c3-92c4-e39f94411c13/xuxibuzedubijokepesaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38932e36-1c55-4b07-9d97-14311fe3eb08/mojexenuwiwesogemar.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/22020282884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b8d5c9a-92bb-432c-94e4-d5ab7b973b8a/nba_youngboy_solar_eclipse_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f63f45-bace-4d2a-936c-5997a5c224b1/hp_laserjet_p4015n_manual.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 5364 bytes
SHA-256: 6b9aa7f17635ecf3786439e575c183dbe49210d7e59e1fed524c665282a6bfa8
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 10640 bytes
SHA-256: 6f946a8c2d9656b402fed20d092667917e14fab432234ee212fc02bcf5e2941b

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