Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb93ac719fdbf1e9…

MALICIOUS

PDF

94.9 KB Created: 2021-09-20 02:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc14be6e87e074b2eb53a387dc63773b SHA-1: 40b55f3bea7cf845fd5fbc2cd3c8dbdd611f65d1 SHA-256: fb93ac719fdbf1e9051ffe18100e75c44aee2a327d201208e9db234410db1a88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs, such as 'https://garglob.ru/uplcv?utm_term=how+to+download+procreate+for+free+on+android', suggest a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://garglob.ru/uplcv?utm_term=how+to+download+procreate+for+free+on+android PDF link annotation
    • http://bargiel.com.pl/ckfinder/userfiles/files/vugopejabifibikukir.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/42113123085.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/68318337963.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/xilemigodufuxegab.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ulasu0o38lfchbvlg7pnthr65e/josobenipinajefivafuvup.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/xezej.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210912_122605.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/bazosibikabofaximop.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/taxezipirutopinamexe.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/28745972617.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/10496265975.pdfIn PDF document text
    • http://labotinnghia.com/img/files/radojaduseluti.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/78470256902.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/49926348888.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nidexof.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/46637457478.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6750981305.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/16736255299.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/86538745142.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/73402116608.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a84f4f102---gisone.pdfIn PDF document text
    • http://jfe.hk/userfiles/5537484812.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_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 10524 bytes
SHA-256: 93b587ee03b68ab1d8881cc6db30f760ff5ee3f84ce1949f4625a7d69fd3feb7
font_02_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 18708 bytes
SHA-256: 63735bb135d0fcd26d5d0f220fa1b7104c2d18de8f790b81dd47189b3c55e391

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