Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c58c0abc23da19…

MALICIOUS

PDF

70.6 KB Created: 2021-09-19 01:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85b660f879f5e52c03ddd7303ba62a42 SHA-1: 986ca8054438f826767fb8769cd33268eed78f5e SHA-256: 75c58c0abc23da1909f2b3d3aec5bd4bc72baaba8bfe4161f6362aa5e8d633c7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score confirm the malicious nature. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eetravel.net/file/wosatorexedunapu.pdf In PDF document text
    • http://krasneclanky.cz/uploads/25809154275.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/42552081560.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/gewosavix.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/lubafuvesaxa.pdfIn PDF document text
    • http://praguetransfer.com/files/file/feparodaj.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/4859864903.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/bajenobolave.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/xadapegidizupizumebi.pdfIn PDF document text
    • https://signika.pl/Upload/file/loparetetaxol.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xujizirizalemutib.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/nukuvoribajogawido.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/kinotudik.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/kedogeweposuboke.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///53703042541.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/ledobolukanenepizimufina.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed279d919d---dubusebinogumekunom.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/zezivojarinepane.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sowawujuzigamasukekos.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/24045456263.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210915_6E97C9C04429F810.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/rivurat.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/21365847858.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/nokemovademukitovabuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+skin+mobile+legend+iosPDF 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_off0000b5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 15244 bytes
SHA-256: 81465d47b4cec8a926de31538a5e4be82474d07f061376d7aa4ead6a739cae39
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10740 bytes
SHA-256: 1d7e3fd81397814d0694db2f3af9e356cf35ebf4754f4e90b9bbd6a5579a64ea