Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad901a0f40423313…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 13:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 972415a34046f891b3d9e4d6b5710ffa SHA-1: 1a8eeb2fe5ca8d874dec052ef2d1c3f08f65fc00 SHA-256: ad901a0f40423313e0f65de6d03baa4b67b84c7b8adcf8d97b43bf761bd4873d
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links pointing to various domains, likely as a tactic to obscure the ultimate destination or to spread malicious content across multiple sites. The presence of many unknown URLs further supports this, as they are likely part of the redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://danfort.lv/userfiles/file/35006860706.pdf In PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/17608289168.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nixujemef.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/96778255509.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/midujomisududaxop.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/14556820527.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/fovamanulexa.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wewexunikusev.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/73621021132.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/resaxefakil.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jeximatar.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137459df3e39---56616122280.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/sadalumewapegitadojavosus.pdfIn PDF document text
    • http://ahchala.com/img/file/lefolabirijiwab.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/levizozoxemekerobadiwiz.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/38672538396.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/41041993533.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/jemojezura.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/36921033198.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/73792057483.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/tolozuloxujolopafafu.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/86377648505.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c003fc48ca6e22d860f2bd994afe2b72/87417601659.pdfIn PDF document text
    • http://ccadl.com/files/20210909055001.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/davutafevunuxada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bloccare+contatto+su+androidPDF 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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 18016 bytes
SHA-256: 5f3b0c9d6f77f20ec8d6641dc18677126c06976853b3df0f7a1b138f1a5a1d98
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 10516 bytes
SHA-256: b7d83096993f0f684a5d3d0dc1772922c1ff84d2fa9ae6ae7846788adf66b467