Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5e30b6a9ba1eca…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 10:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d41ee82d9868a01f531e1bbe00763e15 SHA-1: 741e97eee8cc45b06c7414ef8f8487fa80dcf975 SHA-256: ad5e30b6a9ba1ecabc3b7824afba02d5e444ee83dbae521bc8ff3ab3ad5201d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically flagging it as a 'link farm on disposable hosting'. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://unitytradecapital.com/ckfinder/userfiles/files/19287933870.pdf In PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/49567229938.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/81560655927.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/diburoxozisegubori.pdfIn PDF document text
    • http://fpole.ru/sadm_files/6239429046.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/dijabiwanowiw.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/43314701377.pdfIn PDF document text
    • https://techlan.pl/files/file/jemuv.pdfIn PDF document text
    • http://skisun.it/userfiles/files/vepipekenisik.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/48098129566.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/xekenekis.pdfIn PDF document text
    • http://fohow77.ru/upload/file/tijodiverabowag.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/lidogegirezaluguxipi.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/duposorumew.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/vumoniluwawedetabaxonawen.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/10277209420.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/jabusizamepajipugi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631439918.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vimomebotogiwisanebulopo.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/79897125613.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/410a27cc0a59034c7dc1ddfc31936014/zijeroposobalerubanuw.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4081ed9e0df74d3c8092b5dc9c851275/sedidulowedibuzuwex.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/wizoxipazeg.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/mudikemowawibe.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/webadivararas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=analysis+bet+hacked+apkPDF 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_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 10716 bytes
SHA-256: a2f048334af8526e0fb68293a37d0d202455afc28fac3ad5f8d57c56892e316e
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17380 bytes
SHA-256: 1a32324c47223853ec5613612d089f72175eb69cd36fc009059a924d51bd3a75