Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eb06714e117878…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 22:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45f5a8b7008ab1fe1c354d04cf88da7b SHA-1: 5447454b42b2d5f8f3216490ce0f0d27ec533bff SHA-256: 78eb06714e117878aee2fcf5e6aa4df5fde3461984f46ab4674840fb163a63e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://omni-links.com/images/blog/file/tuwurumefeladanelas.pdf In PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/59006222740.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/lizusuvo.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/ganoxejapop.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/sorugur.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80e7c3c5---32881943821.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/34890835280.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/jajaxurogelubijojodu.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/64817454217.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/52792672958.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/70914916885.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/jimavevuruvu.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/67533703010.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/ferosawakizujupasosiwamut.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f83429d719---42773243329.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/18885878866.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210912190157.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/43671985062.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/zumibiwago.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nuzawitivubavu.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sitemugidelubefa.pdfIn PDF document text
    • http://orthodoxnews.us/file/92525357189.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/favewilexuzev.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210902044701096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=live+cricket+thoptvPDF 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_off0000c0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C0 17008 bytes
SHA-256: fe67a610c8a421eea949bd6d9bdcae076745b3ad145a618d14f2fa1d826bd173
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10104 bytes
SHA-256: 7b0d4f48ee2c9ced7f6d8d22e01d197fc1b83e98f7600b037c6695be38ad0902
font_02_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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