Malicious PDF — malware analysis report

Static analysis result for SHA-256 f398e397ddd9c01b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 08:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48bcdaef9981c2001f00c6b9e3470a48 SHA-1: 29a8af1fa0c3f7c6157b92dc90451e8ec998f17f SHA-256: f398e397ddd9c01bd9ff8e2af2bd59cbdcdd241a792971f9e2ffeccc955cebf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The presence of multiple unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://cellfruits.com/ckfinder/userfiles/files/nenikomavapowovilokorupo.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a53591de---somutemadomatagidamosaw.pdfIn PDF document text
    • http://vswet.ru/f/mosilukupurabejiran.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1632215323.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/ripazixagu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vokavojavafiwe.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/jakizibeji.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210924_090448.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/57993008695.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/48039678355.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/6660966790.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/ravipiwijebi.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/31942977578.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147e765908b6---46135679030.pdfIn PDF document text
    • https://pokereshop.cz/data/file/20735311226.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/35185686797.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/jozazenunigumabonul.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/tuferogebebuvirizezit.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/jokedadoxixalotanogupus.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210906155251_1078761237.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/barajiba.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/74114661054.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zodikepatej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gta+5+offline+money+cheat+codePDF 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_off0000af9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9C 15328 bytes
SHA-256: 60c5428b2792ecfb6646c76cccb1f41f62eeca0abf092ecbcfbdd06f35625246
font_01_sfnt_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 10760 bytes
SHA-256: 5ed248343a9c32a4d806d9a767dbcdf819333975aacbfe7a20c024abc2afe5ef
font_02_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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