Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efe35487b6acf70…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 00:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc936bebe1b5698639e262eb55eb91b5 SHA-1: df4cdb970e979d182194bd851c29811aa597d703 SHA-256: 0efe35487b6acf703e47bdbb36a6aae08f7b6f0b786d0fc23dc502b9390c141d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs pointing to various PDF files, many hosted on suspicious or unknown domains, suggests a link farm designed to redirect users to potentially unwanted or malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.puhito.hu/uploads/47282537630.pdf In PDF document text
    • http://hotelniagararimini.eu/userfiles/files/92352613701.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/lavaru.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/pujezotajixedasafanomawez.pdfIn PDF document text
    • http://vanhacollection.com/images/files/30968903354.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/81242130017.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/41265640191.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/nategabarasuliroribupa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613383e3f3b26---mukabaxovejizobolutef.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/40891859206.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/21412165617.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/eec4bb967a0d6a24415559c37f81e031/58785315860.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/balufuwimu.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/83289423855.pdfIn PDF document text
    • https://recrut.com/files/files/vofetilavimav.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/17479606994.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/10962513224.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/bevolawebu.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/tozibimobosojadoju.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/7316532540.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/85747520283.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/fosabodidojibozepof.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/jajidepagos.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090905010270554.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tupidi.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/bobumaxabomaxakuluku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+cleanmymac+x+full+crackPDF 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_off0000c7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 10776 bytes
SHA-256: ab67af862bf100b8a1960ca338d8d1f253b48afc2f4ed7e5843128c1f5d78700
font_02_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 17516 bytes
SHA-256: 7100e3870cfe4b42817f068b0b5dd06f8de340adbc3a94757b7d313cf04b169f