Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f70eb42ddce235b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 21:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87183fb6b705cb807e61d52357b81163 SHA-1: 18faee9c10ceec68c707bf60b1fdb6d9e451ef28 SHA-256: 8f70eb42ddce235b261e9f230b881a613e245b619906c904b87b98bff51c60e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context beyond the PDF structure itself.

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://olech-rzeszow.pl/userfiles/file/26374755734.pdf In PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/2552895301.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fokanijarajarinesok.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bofozakobajap.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613402ab4b5d8---17567514968.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bezawopal.pdfIn PDF document text
    • http://zenithmetals.com/files/kezizogewuno.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/jufaziva.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/pilikemum.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/jekagev.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/teziledilekavez.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/18448789500.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/11666482135.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/roxenoximimo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xepejirivivifijolore.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xuwivosexawulanesi.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/14093180585.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/25742653825.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/63903156323.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9307cd.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/wuroluvavuw.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/bamujizonumi.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/lejijulopesogamu.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/78113646672.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vufekuwenobu.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/bepomonofurajijogubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+developer+jobsPDF 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_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 17584 bytes
SHA-256: 3c0155e3be292e29af4c68a273fda13de81e8d6e30f671b1c4d960eb1ea056ee
font_01_sfnt_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 10440 bytes
SHA-256: 8ccbf2f5959cd8b931fce78a9b122642e71edd82f65792b07967c02a9b7b7739

Open this report in the interactive analyzer, or submit your own file for analysis.