Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c611363dbd920ed…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 22:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c9f4aec1e55de51ed77d9869d370897 SHA-1: 67e5cc4fd2544c44068ab5e0691f6d7d6ab6a9ac SHA-256: 9c611363dbd920ed97d57890c0477cbc5e88b840640a52845ae82b7da90fa594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of embedded links, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of numerous links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://automotiveenergy.cz/userfiles/file/mariwasusirimatolujudafa.pdf In PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/65265698300.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/zajokuvonuwugesa.pdfIn PDF document text
    • https://parc-hotel.info/file/wunifivaxenilezedizali.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/fewomosufuzadif.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/bezukul.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/xiwamapigidide.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/50944044629.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/38475390664.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/26655271625.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109092006155911.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/nojetavewawuwad.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/rorexipinarodovebibewa.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/monex.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/zobajameredefokipape.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/suravitisajo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384e1cd6772---54829952437.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/dupifojolafuruv.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/17212117999.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/zevufibusofatixeraluvubo.pdfIn PDF document text
    • http://sungder.com/upload/20432745744.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/81160935205.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/miravisofusobinibewawur.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/59820402044.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/ninisem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=infamous+second+son+apk+downloadPDF 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_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 10720 bytes
SHA-256: b8184d26223c98245999a35e312815362e5b2e88484956b8e12108bc14c51e50
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 17184 bytes
SHA-256: f8d3f42ddda17a4cfa04b8dd4cc60c0ada1241bcebd3c9412fda11a17cf1a726