Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e7a5c3d9470df0…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 04:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9bac6d089d04a481a0957c7947981889 SHA-1: 5136652fdec91cae29c9c2f24a245ff40b4637ab SHA-256: 13e7a5c3d9470df09d72bde09dd9675fe228b008c6cbf1c59c5bcb64b8307dd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=game+game+hacker PDF link annotation
    • http://newtarrytowndeli.com/uploads/files/79811387795.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/mamerikuz.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/9243536749.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/23817565890.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/32838084822.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/rujijizituzufagemevunuz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/43781335083.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/70923798811.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7190100884.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461aca1add8---42217014576.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/vudogaripeledi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148df6642ed4---87944802155.pdfIn PDF document text
    • http://wirheiraten.de/images/file/zelifako.pdfIn PDF document text
    • http://ranch.pl/files/file/53891780665.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/39828145388.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/61673302338.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/95240652725.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/14551210909.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/kajoba.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/41706831293.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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 16336 bytes
SHA-256: ad3dd385e2149fa56522879f3ab534ee150fa5add19097073c7b7ac1bc9cba01
font_01_sfnt_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 10180 bytes
SHA-256: c32ac48758a513981ece245d7340a02838ab4d4d01bd2c81ff721e8fd6ae5060

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