Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e2d9ee00305528…

MALICIOUS

PDF

86.4 KB Created: 2021-09-22 22:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86b276f07a50886cbcc66e93c0319781 SHA-1: 84872178611f1b997e72c87fe893c28c73d7ecff SHA-256: a2e2d9ee00305528d2daa06b75c6795f25ddf4b3f03beffbe96f32d90a9d33b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the PDF as a link farm on disposable hosting, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=best+free+stop+motion+app+for+android PDF link annotation
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/51061655906.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912114242.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_114737.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/sijulutokovafipaderom.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/diboniz.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109171906115367.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sirafasexivirijeg.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/gatede.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jepabum.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/15598427507.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/tibibetufem.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/girukuzatumarepe.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/tuwizafarunogapunokisaga.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vamikefekib.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/79112385325.pdfIn PDF document text
    • http://yjccnc.com/upload/files/93317262553.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5c4e47260057c7515c7b74e5e1abdba/14507018240.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/redezipuru.pdfIn PDF document text
    • http://katachizu.com/img/news/files/sopuzunavape.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/lulejutijulev.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/58351407594.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/86831161804.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/21455990990.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/74039752800.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613518cf25a4f---lubabixexawononowazoz.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_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 18056 bytes
SHA-256: 32c165da43f87f44ad69afb79583715605c92861ded7f6c8fa229c88f92c3254
font_01_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 10664 bytes
SHA-256: e408dcb1bb6037dc19de287b86e77935ae782a6e3b73b2d66c339001e62ce64f
font_02_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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