Malicious PDF — malware analysis report

Static analysis result for SHA-256 144ebf88a0c737e2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 11:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9ea88942daa9a87b2bb12319a3378d1 SHA-1: d906bb62eafcddef33843bc67948efd428c5a7a7 SHA-256: 144ebf88a0c737e21be09c47c7db08ecdeebf1d01b4121f2b29eb3b8bde25ed7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with many pointing to unknown or potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of the document being used to redirect users to a network of sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://padservhosting.com/userfiles/file/kagulekini.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141532110cdc---fedipuxak.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/32192729094.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/15557610138.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/numobidusatarixisu.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/refupojusunose.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/digaxuxolerekin.pdfIn PDF document text
    • http://parentini.it/userfiles/files/85452772157.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/joraruzalop.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/26567381352.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/64255387962.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/29377015165.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/parafaw.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/39989367467.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vkc9imf1ce16brojpf43ge73ai/waromoramijoxegiruf.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/raziralapunesezijeduvuwab.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/40002761255.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/65182998493.pdfIn PDF document text
    • http://okvin.org/userfiles/file/dasutipesun.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/52665344987.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/93768949088.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vilirot.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/lokilosewapimifomodilino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=unlockable+bootloader+phonesPDF 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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 10756 bytes
SHA-256: de150fb463588e7a94a40d418d952dcbceb03b3887d0d8d39f7d3bc9c5ff30ff
font_02_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 17188 bytes
SHA-256: 5ba1497c92e3f7fcb0a52a02861f9a8f81a3d29758998679d87f73ba4b981452

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