Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a4a9ef16dd9370…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 03:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36a533fcc55dbe8ba2d664fe2aa285a8 SHA-1: 4a6bae5c2cd93bba18e882d996b5cc11ad8f64ef SHA-256: 53a4a9ef16dd93705f80148411247c24e12affcc5dc02d8eb575d911b6898e78
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The embedded URLs, many of which are unknown or lead to suspicious domains, support the conclusion that the document's primary purpose is to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable.

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://akbarestate.com/survey/userfiles/files/97147420891.pdf In PDF document text
    • http://tieulongcopro.com/luutru/files/97892061157.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/18580863239.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/zutonuxogufuwamux.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/18709458723.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/zazujip.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/5930171621.pdfIn PDF document text
    • http://yepuco.com/uploads/files/suwuwova.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/wazigujuk.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/ribar.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/sokitigolalodedonuf.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/86384956394.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/73271334870.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/tabudamuxomelupekiroru.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/42728856717.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wifapabakozipalolis.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gopurig.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/47485048573.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/fagugulilot.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b756df7f5---povisevozirasapa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339299e4643---46011549.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/2597211886.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/tuzejaxekevirotamapibesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=munna+bhai+mbbs+full+movie+torrentPDF 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 18928 bytes
SHA-256: eb333934c798acad94274f9c71f9a8e53eb2f4d462c00dd3d005665aae55e823
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 10780 bytes
SHA-256: f8abf373ce2fb7324b9c51ff0ee204a2ab7a2d6830e6f383fb8ba412a9c819e1

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