Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9c572a4466fe7d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 12:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 961109e89009c8210dc9da244ab085a6 SHA-1: e20f452e0cae22d6e6e3002af9368f6d621b5132 SHA-256: 2f9c572a4466fe7db96dc1e8835dfba7d22f0b1fe7601d01e61db6abf88a38ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://driscollandgibson.com/images/edit_images/file/zevelatosarofij.pdf In PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/36086270294.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/29670512559.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/78330129744.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/zadin.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gaxoguzosof.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/89620638246.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sagedalasarefevifepat.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/75629677550.pdfIn PDF document text
    • http://stonebreaker.at/2460479278.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/7374481023.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/nesamigitubuxaw.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/sinomezilanidisubokuk.pdfIn PDF document text
    • https://vitanov.rs/files/11744933655.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132648ccf468---majowojajejugebosever.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/nebijaxinoxeboba.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8cac4253e80823538614bcd38aa3a648/xexutugibutuxasanod.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/fupamekojiwimatomogaluliw.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/48389592923.pdfIn PDF document text
    • https://curvy.tw/upload/files/56199069905.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/44221639272.pdfIn PDF document text
    • http://stevis.cz/files/file/wewigaguzasiwetixejitara.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/xuwove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=no+verification+gta+5+apkPDF 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_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 10708 bytes
SHA-256: 23377227ef08c0557cb81997bcbd1951e986c9f816c528df8e93aaa4138da862
font_02_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 16820 bytes
SHA-256: 89b37a2f371741dba389f15ba04bb0eec0ee9ff3593dc8df633e31030cb6a9c3