Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db6ce4d1cbd3b07…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 14:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef4d2955e04bfc5500598c43fa554729 SHA-1: 186e6b282e7be4c16152af91be52fc01403b89bb SHA-256: 8db6ce4d1cbd3b07ba6055b626747c4de479634ea28f04f7becb5168f135d7c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious files, and a heuristic identified it as a link farm designed to trick users. The presence of a 'download' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://parlagame.com/calisma2/files/uploads/zezatir.pdf In PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/757838221.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vidojusurufunowexe.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/25401694960.pdfIn PDF document text
    • http://veitali.com/upload/files/66444715963.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902001810102196.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908022531.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/lorovepenutuvunatokasul.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///wibederenemazemajuse.pdfIn PDF document text
    • https://ms1oke.com/contents/files/takinozi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613084e40dfeb---kelonujurimenuw.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/99818175484.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/sivavimifet.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7aa19563---pidenerowinipapexikubetow.pdfIn PDF document text
    • http://apsons.eu/files/file/pavojuvorugigaguxupomed.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/dilunapegupizo.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/92018132599.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/16806428817.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/25167412820.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/jagakipepelusiva.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/pejomajeg.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210904161037.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/kekupovuganonezuvupi.pdfIn PDF document text
    • https://svltv.in/userfiles/files/94428664457.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/leparuxumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bleach+brave+souls+orbs+mod+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_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 18496 bytes
SHA-256: 624270bf7918d9e6055c6ddbb1b497e0256c5e229347069df2d60be9c51804ad
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 10936 bytes
SHA-256: a96ca170d4c398a722f1e9a74fda98a0af0448d38e9f5e9b420b0f96e05f2255
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1