Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc11bfdefc4cd8f…

MALICIOUS

PDF

84.6 KB Created: 2021-03-01 03:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9267e55be39949a94187b46af614f132 SHA-1: 6c0d2cb8306ade8ec2650474d2be52df62bc63f8 SHA-256: 4bc11bfdefc4cd8f126bfb414f8af1fc83a2636946b9b21ef4fcaf5e59cb1be8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of low-quality links, likely to obscure malicious destinations or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=how+much+is+a+2013+hyundai+sonata+limited+worth PDF link annotation
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/508953.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/vatibupakoxat-fadufogudopavid-tifidelosetu.pdfIn PDF document text
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/5169416.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/mIDgfIu/4624351662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_60065817d2b4f.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/7735097.pdfIn PDF document text
    • http://vebenuzan.22web.org/allah_avalente_pennakane_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_601d44ba7d070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_5fd2173cd8688.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/dopunidegemoseteje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolasuwukino.epizy.com/bresser_pereira_livros.pdfIn PDF document text
    • http://rugokabiko.epizy.com/learn_python_programming_masterclass_udemy_free.pdfIn PDF document text
    • http://raferizowum.epizy.com/how_to_setup_scan_to_computer_on_hp_officejet_4630.pdfIn PDF document text
    • http://bamemuwibe.epizy.com/barycentre_triangle.pdfIn PDF document text
    • http://dololesorut.epizy.com/autodesk_autocad_2020_lt.pdfIn PDF document text
    • http://rujekikixew.epizy.com/equifax_credit_report_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/havaianas_infant_size_guide_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/21668878253.pdfIn PDF document text
    • http://mejusamenubeto.rf.gd/63840364092.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_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 5824 bytes
SHA-256: ddd8e0069cee34ce51434d18623f096aed9018a766cdc9a44abf9054ee3b7bb1
font_01_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 11236 bytes
SHA-256: af772c82cd34e9661fbd796d95b9dd4a44494da781b107ecdefc5ed19dad41de

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