Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64fa9c05d0fc0ad…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 09:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22c93ee8390949ec0d6a5658880cbfb4 SHA-1: 838ea0ddaa699a01a200b150565ba9b97161fcda SHA-256: b64fa9c05d0fc0adcd7cdaf9cd248db49d9af3f38a7cde2b872b0bd6680e00d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://standsimulator.com/ckfinder/userfiles/files/13768850686.pdf In PDF document text
    • http://yhbinternational.com/userfiles/file/7749356325.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/834180823.pdfIn PDF document text
    • http://kag.fr/userfiles/file/sefeme.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/tolomenagekazabima.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/54209208217.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/67170067050.pdfIn PDF document text
    • http://jiuhuapm.com/upfile/file/50237705731.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4c8963877588f6ddc1ec18b2aadf1e02/16750257768.pdfIn PDF document text
    • https://tonicsuitemusic.com/userfiles/files/vulav.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/xadugebi.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/7726676829.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/tekefiwekel.pdfIn PDF document text
    • https://priscar.com/documents/files/sasadapi.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210906121706427962vamu6o64biyt.pdfIn PDF document text
    • http://mlead.net/images/e/file/26584766696.pdfIn PDF document text
    • https://betsin.org/userfiles/files/zifamoludi.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/lototukojavoloboja.pdfIn PDF document text
    • http://dges.in/userfiles/file/jizuforotujofajesenibod.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/93527686869.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/33631674129.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/61496369452.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/33501931677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=finn+and+the+swirly+spinPDF 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_off0000aec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC7 14852 bytes
SHA-256: 7992973cd2df5ed66cd553625dc8285a036b77ff78b5ca62600c355cf0a61583
font_01_sfnt_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 10548 bytes
SHA-256: 1edcd0e742b3b66300e914a68cd51db4e1284591040a876e2b5f97bb27f885ed
font_02_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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