Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49887b169f422fb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 22:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1054da4f52b2e4c341bb4aeaa6569a42 SHA-1: e0050b1c08f106e0ac9a737d64f23268091642b3 SHA-256: b49887b169f422fba9daddd43e7b4fa3f5b6318c4d485345f1be3833fcb7f511
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to unknown or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://valentine.tutaylamhet.com/storage/ckfinder/files/nevorerakutarajir.pdf In PDF document text
    • http://baovekhucongnghiep.com/upload/files/poboxoxofosunoneloz.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/marewamusugigawajo.pdfIn PDF document text
    • http://grandfiltr.com/files/file/lazogetaxilebetima.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/16238085024.pdfIn PDF document text
    • https://grouptm2.com/contents/files/xikafoxegajimomoroxaxewo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/1506950890.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/juzalaradinaz.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/61321658618.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/wutivafawazugavonaz.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/29011445439.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/24978437848.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210905_96DD14DAF7E3BE84.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tagokepasifukufarukoj.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210911201253.pdfIn PDF document text
    • https://deepex.hu/hirek/files/pofapakufemozutuxa.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6285a893---90036724140.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ind4ve5bev7fhlef4okc2pi4ru/fadifakavorelemabokegive.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/83323678469.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/83158075329.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/26351011268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bloom%27s+taxonomy+revised+action+verbsPDF 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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 17756 bytes
SHA-256: 8f2ca6112566e46fefc4a83739ae315378a76ba5436a5ec68f3b1459756f1515
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 11040 bytes
SHA-256: 91732a6b4a73f926ce4d9a383d3ee4703d6d459db1c44e50e6da222082783b75
font_02_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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