Malicious PDF — malware analysis report

Static analysis result for SHA-256 95192f9da153309b…

MALICIOUS

PDF

75.1 KB Created: 2021-06-11 06:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c3935d39eb7e5fbe712803258e96edd8 SHA-1: 4a1a7a004e4d079549e0df1c4ca35fa87c079c43 SHA-256: 95192f9da153309b22082831ea5bb9bf7dbe8ad4ffa99c7af9f9a75858b2afe1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obfuscate malicious destinations. The primary malicious URL identified is ketchas.ru, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ketchas.ru/pbw?utm_term=tu+mo+love+story+odia+movie+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5fe7e7525926a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_602b26ebb1648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_600d0e30dbdbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6041f5b06dee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_605f8dfbe7d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_602edea7a5d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fdd5bb1b0ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473047/normal_60486f97102b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fatakalewene.pbworks.com/f/libro_de_derecho_romano_sabino_ventura_silva_gratis.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/w/file/fetch/144664440/legion_2010_full_movie_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45705cb0-283c-473e-b871-89856a732cd3/jewubixumuw.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/144881931/tipojaxewugoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43d44da-d88d-4aa0-bcf0-936d8bae5dbc/73228942824.pdfIn PDF document text
    • http://kufugaref.pbworks.com/w/file/fetch/145026924/ashtanga_hridaya_book_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd68862f-ccca-440a-a463-99f6be6cbf5f/71647385629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/792eb7f4-6d50-46ef-ba1f-c0e3f6333e9c/99546348074.pdfIn PDF document text
    • http://rupuker.pbworks.com/w/file/fetch/145015641/42518330906.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
    • 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_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 5164 bytes
SHA-256: fc54deb271968137ee839573a64abe1f0bf24d37b0f3b562e990575f94eaf0b9
font_01_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 10596 bytes
SHA-256: d765e9ed17b0f1c3951a9e7f347d95e2ed669780c6f7bb9665e0311f62728087
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 16076 bytes
SHA-256: df8916dc0488248139c8b7f8575cdad52201066875df9eb3f38f8be7ce625b0f

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