Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbac06c8a4f969fd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 16:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64336e4607b4bb548f1c5f40e5564896 SHA-1: e448b8aa883cfd599efceec22b7b7a4e4de3705a SHA-256: dbac06c8a4f969fd4ce203ac604cd57c2dcc4eede114a93a35b44c335ee0d700
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 exhibits characteristics of a link farm, with numerous external URIs pointing to potentially disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brilspa.ro/userfiles/file///sanedetu.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/vatubewu.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210920045959677131jye3dmevc121.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/gumodusodudo.pdfIn PDF document text
    • https://equalland.com/uploads/File/pebisis.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/laxurotexodowuben.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85209b5ba---19520690670.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/22453138828.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/64672990847.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/19431766781.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/15310330895.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mesogibavigaze.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/36146993818.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/55812788161.pdfIn PDF document text
    • http://machulski.com/public/file/ratefep.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/46236590128.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/91026767418.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zemob.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/60655282208.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/xapupetikiwaweminido.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/86311875787.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/36048303189.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/jekirizajodija.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/54d914280e3edc7c0fdeca6e130bd836/dowati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cast+a+quiet+place+2PDF 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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 10440 bytes
SHA-256: 5a63a5bc0cea129a8fbd9234d47431156a59b8f462d88cf7a76abe2285daacab
font_01_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 15368 bytes
SHA-256: dfd0ee59bcc85f1c4e5daddacc9ed66258e40cae6ef6c1dc9df00fde712aa09f
font_02_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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