Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7eb797ea421987…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 10:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab502253057598a5f3eb73b80cd025e1 SHA-1: ae748fbf22bc301a93188813d455ae2df08e93fc SHA-256: 3a7eb797ea421987d9eedd4b181225f3654480f02540e894815205f3468d71f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=sajan+old+movie PDF link annotation
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lepukelizagaga.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/konelow.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/87245475874.pdfIn PDF document text
    • http://186086.com/upload/files/gukup.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/12886165259.pdfIn PDF document text
    • http://skene.es/userfiles/file/moxujovuni.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zojuzobezoxofoxifasuwuf.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/rokofi.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zopezobaverijidixofu.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/govik.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/tilibepokeredasarup.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/47e27222dc726ed48f106b98bb61d065/58264786140.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161314fe753240---ruredel.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/15816208807.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/5544498525.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/satuva.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/nexogibi.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/93268199951.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/43120098123.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/jadew.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/62126496042.pdfIn PDF document text
    • http://tochalco.com/uploads/files/wososuv.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/vokuz.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/82197272510.pdfIn PDF document text
    • 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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 20616 bytes
SHA-256: 0e600c13de8d16c621d5d00d6ac16cc9ae1c6b3c0b729d93497c53cefffd14df
font_01_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 10312 bytes
SHA-256: 1000ab7bc76c181c1d4df0c276f39fb11040e1fbd472734fdb14bb1e9964d1cd
font_02_sfnt_off00013a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1