Malicious PDF — malware analysis report

Static analysis result for SHA-256 44094d77789fab3e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 17:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c12912a70d8a8a470ce958350120f92 SHA-1: 2c695d61833d2783e5fc7fcd1e926d3139fdeccd SHA-256: 44094d77789fab3e7eea56f9c18a26830d95d10c0d3809dfde7babcccdcbaf10
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 are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=best+android+apps+paid PDF link annotation
    • http://checopharma.com/upload/files/53094962478.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/24712444209.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/wesafadir.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/fevimigidusawijixelefek.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/74055723546.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109140347504764.pdfIn PDF document text
    • http://crm333.com/documentos/file/38076967005.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/85788673231.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/50072504746.pdfIn PDF document text
    • http://potya.com/walonez.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139fc1e2c3---mizuwunixepexibetivawuxub.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109021207238693049aov5d.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/larozuwovorojafo.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/22091169328.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/gubisekaw.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xalotirure.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/jewixivewilusudez.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vikaposejafodefodug.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/vakijoxele.pdfIn PDF document text
    • http://dominant.name/userfiles/file/zotezizemoj.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/17948220074.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/77817911887.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_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10392 bytes
SHA-256: b700453a26c068da83eae2c3ac5645330d6ed89f3415f8107e3c23ecc6166cc7
font_02_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 18368 bytes
SHA-256: 90ff9e0756e30eeafed1c333b65cb5ab337983d05333b4ac84991eacab7c5170

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