Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b9c9f62114d080…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 21:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9523b8f5de01dd15ce427fd0e57917f4 SHA-1: 66e027347e45bec1d432cd6d873f3792a0d19e66 SHA-256: c9b9c9f62114d0808f1c102b19b0d3d2b5c47a7319abe8f141d9229df95b7b7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Multiple external URIs were extracted, pointing to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=how+to+transfer+contacts+phone+to+sim PDF link annotation
    • https://ochronaskory.pl/pliki_user/File/95426705903.pdfIn PDF document text
    • http://unityproductions.com/upload/files/nejojomolowi.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109141206495899.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/nukas.pdfIn PDF document text
    • http://chayka-svg.ru/files/lujilowizedupelal.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/45c6b7b8bdfd7be92da129d2ed535161/86209031488.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/lokirevukumevojituzit.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/zexovar.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/40124590370.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/77901198437.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gisepajuniju.pdfIn PDF document text
    • http://afro-safari.com/upload/files/jaropupazora.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/95022825850.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q8lrj320nn35ns020ot3pn1bmm/30944699091.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wupanitixegibuwi.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/58033407629.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/tosekegipefu.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-7/20210907181950735364.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/76423879279.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/nuzuzugujefup.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/16789796558.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/tobagomixesibudozugas.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/vetape.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/genowe.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_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10776 bytes
SHA-256: 2fc43fc11e18fa584f642c771a2d406453ad17835a9858c70489ff07a5e7c25b
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 18300 bytes
SHA-256: 493b79ace0ab8fd9aa60742cd8d25cfc913a29916d294d4932aca7c26ed84f9d

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