Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e7a45ac7381439…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 01:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9278c144de5a0690d2826e7cafe26619 SHA-1: 33b244e342b1af014d561afb50310e42568982d0 SHA-256: 63e7a45ac7381439158bbef6b54155a878baa5dca8c75b89c00a78d5c33d65f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elitacasa.it/images/file/lisawivisuzigaf.pdf In PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/43835636956.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tawamadarozetelaged.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210920134342241669.pdfIn PDF document text
    • http://hidropro.hu/upload/96408642918.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/98183829006.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150dfeadc447---levibuwopibepunimupum.pdfIn PDF document text
    • https://onecre.com/images/content/files/wabuzodekolowofarod.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/52876903558.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/mejamuvefolitijepo.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4f18d43de4ef5338ca828865e6c353e8/dinakalosigigemod.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/rufelefibiwupexatex.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/kunanadaridonibapuburin.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/61809322624.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bavinigelowamujiguwo.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/koxivubisuk.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/muwexopowaxajefif.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631574418.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/854725963.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/sizebusiboxup.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/61897096588.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/13246584548.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/54732536940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=computer+alarm+clock+appPDF 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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 10396 bytes
SHA-256: df9e5297210968695472458cfc62f849de0fb2bf2d6818a9b0c959bb95be849d
font_01_sfnt_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 14312 bytes
SHA-256: 42a3f0bf68ce25d0fd5b5249b0778a9fbe4422a5f62e5211de2db316b2b022a5
font_02_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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