Malicious PDF — malware analysis report

Static analysis result for SHA-256 a008ea5563105c99…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 01:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43d0a0566ec0edfa71f8209923a999bf SHA-1: 016e417a0d7264a0fba9cc43f226c5a0904f1f55 SHA-256: a008ea5563105c9966765fccd939ce5be9ad912cb5ca8bac4520eb2fc5570284
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=by+parts+rule+in+integration PDF link annotation
    • http://studioagronomoserragiotto.eu/userfiles/files/79729940323.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/wopem.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/iijkot8fmch98ldnp8ohvra032/nukiletozemejisofawoxov.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/92254275722.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/73034827539.pdfIn PDF document text
    • http://metzlerranch.com/userimages/24532944401.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/donenixi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/dowasanasinaxilaluzej.pdfIn PDF document text
    • https://actor-conseil.com/files/file/87514724922.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/zulobavozafo.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/42183980983.pdfIn PDF document text
    • https://dm288.com/slicice/file/werodi.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/39072854458.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907155758529.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/lavamujer.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/79141477812.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/43794582330.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/buvuwawad.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/fekuzujetibesefunibas.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/bigupukug.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/11862792079.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://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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 10696 bytes
SHA-256: ee082182e5244f16896a0ca63198a3a7f78d1a09fd1f6b79048fab84d6c7a6f8
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 17844 bytes
SHA-256: 5ddf5127b5579de893eee4a2713b0ce3db78c78418bcaeea4474dfc102ef03e4
font_02_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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