Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cba5529aa936bd…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 13:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d619391ab0a8f25af413cc64052c0b60 SHA-1: 946a17beaac653ee7aa93488629860f9c345826c SHA-256: 10cba5529aa936bd26e30aa4617ea06c9604820adbadfe849dd564bd06bd9a6e
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to thermostat instructions, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=how+to+turn+off+american+standard+thermostat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410004/normal_6006128ad7882.pdfIn PDF document text
    • https://bobitakakafaze.weebly.com/uploads/1/3/5/2/135297082/9eafb1e03022f72.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/haUjhIE/89613098663.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/50935772589.pdfIn PDF document text
    • https://sibolapitabake.weebly.com/uploads/1/3/4/4/134469628/vanolukoxodarugib.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/99322376792.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/05c724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_600069d766f61.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/rgggfmC/pidofij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_60321b1c88909.pdfIn PDF document text
    • https://rupevegix.weebly.com/uploads/1/3/4/8/134887155/piwoxujamo.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/2676924.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/dudix.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/jurakomipidokonetu.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/powagu.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/f1182fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487658/normal_600559f66777f.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/egcDAHX/30536592684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/jusujujesujojupegajiw.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/fupavefo.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/10840286650.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/manual_de_auditoria_ambiental_la_rovere.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/nematodes_mcq.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/html_style_link_href.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5280 bytes
SHA-256: c1c3d6e8fe1039784eb552f032feb658b382ba3ab3c9020702553dbf2bb6da72
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10512 bytes
SHA-256: 07741e69104dd0be4fde8208693696ae1ebc68015682e542970e441cfb5a7679