Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b16d0df099c33c…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 05:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef5850f24def0b2424b4b1756cd1706e SHA-1: 09c34097aaffb56b8e571b02d1a70f77a4f80cf5 SHA-256: f8b16d0df099c33c6ddbc44e769d882f2ceb9d926ab1b7e36826b4faf16b7e08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedokiligirafaledojiged.pdf In PDF document text
    • http://samurairamenbar.com/uploads/files/nunofaraxoxagelok.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fimofuw.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/39726388540.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9ee02d72bec0a1cc5b33689d6cf2ff1f/96128282431.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/74484904368.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/27642360963.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/52971798213.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sanukoguvab.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/15352388121.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/vureluro.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/juruvubifanibetek.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/7987919670.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614776e537ce1---suxelumafi.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/jawakevumigul.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-19-23-12-46-66.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/17387069036.pdfIn PDF document text
    • https://novsport.com/content/File/ponixegesuziviz.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/39695215587.pdfIn PDF document text
    • https://rintrans.com/files/pojowekagewojepugel.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/tadazojorubesarezumek.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/funijajazafokezemajaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=battle+cats+hack+discordPDF 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_off0000ac4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4C 10508 bytes
SHA-256: cb8ab82136cda207a47032908e27a43d78b201aec7078d60f5cabfafae2ebe97
font_01_sfnt_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 15284 bytes
SHA-256: fc18bd6b80124dac192cd5639f82a1ff4042834c945780f0647cae7f9501e5f3
font_02_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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