Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcd3e98f22ae2cb…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 23:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 26a3509131c2f2f3c8e155576e881420 SHA-1: d97fef77a206f64ba56efafeede75269c1202086 SHA-256: 3fcd3e98f22ae2cb0fc3fd9b5abd2927da59517597070c100761a1396ad26b97
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to an attempt to exploit vulnerabilities or execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://synerhu.ru/uplcv?utm_term=soul+knight+for+windows PDF link annotation
    • http://zuche0551.com/upload/file/17109944025.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zuxezepadukep.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/255717313.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/20446656660.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/loxud.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326f02ba3c9---vefuvisaxodabamodifuros.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/5271474836.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/bemamiji.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/61319619210.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/wusenakufixakoduso.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/subigonedijibabokozox.pdfIn PDF document text
    • https://olterus.com/contents/files/34386309634.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202194113143.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/36692459764.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/fajusexekifizegefena.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/49988406076.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jipobuviriwolidijenubal.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/nezuxexowabijaketirabot.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109301555187774.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/66913377912.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/84972459145.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/4334268027.pdfIn PDF document text
    • http://didopack.com/files/21963573348.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/88845800349.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_off0000ae4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4D 14844 bytes
SHA-256: 71750cca30911c8e23a154de0e365857c6a288e9930f23856d75ed95acee935b
font_01_sfnt_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 10692 bytes
SHA-256: 5c3e7a03a7db9d34ea4f0447a47f528eedd15f284a9084d3deb785c4c4af1fa7
font_02_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1