Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8ceee342013c30…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 10:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f188cabd6b1b28d7ebe836c463e7bf9d SHA-1: e13d7563e92d257aca54dac4cb83459ce56ca0cf SHA-256: 2e8ceee342013c303754c564af93a67ab9f6ec46951a932d7e2b6425d96271d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of hosting potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific intent beyond being a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/bumivirefu.pdf In PDF document text
    • https://harom.ro/files/file/71253117405.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/bowegeg.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/70066165464.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/83728351980.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/79002486354.pdfIn PDF document text
    • https://kildevangen.dk/files/pidapujedodexijajub.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb29663c72---4075488074.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109200258345290.pdfIn PDF document text
    • https://pepsima.biz/files/file/xetorekiwusuto.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/girez.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/tibidip.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/sawuwuwebijitim.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofawakafetetof.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gusibepuwulidoxuzizag.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/69280453712.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/ronugipupofutuxiv.pdfIn PDF document text
    • http://thevalleytrader.com/files/susokomajupetaju.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf86ca6d54---vizunamukofe.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/5006564201.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/piroxuvoxebagiwuwitunen.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/nupebezilipexalunujopezul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=indian+idol+7+winnerPDF 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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10060 bytes
SHA-256: 2a41eacfce1f49ceb43cd8fc15d9417ee95b9bd52f4b2bc6b55604741760cff4
font_02_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 17088 bytes
SHA-256: 1079306cf25e30416caf66b2e4568108508262e8b867a5bcd4a39b1a3ff71e0c

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