Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68b621080a13264…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 02:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e413e9f2ca9d862c0aada1af0bc5fd3 SHA-1: 5277ede5cdff1ab61275b97204627cea8b4a7327 SHA-256: d68b621080a13264407759cc8608992a6e53d56c5ae3896a4bc1f83a476598c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and numerous URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://clubforeducation.com/FCKeditor/userfiles/file/fasefaf.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-14/20210914093917962986.pdfIn PDF document text
    • https://schmitz.cz/res/file/xitabudow.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/98017153795.pdfIn PDF document text
    • http://fluorescent-training.com/file/kusexasowivananozexun.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/poxuwalemulilinebi.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/vimawevikiliwoluzivupovit.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/japefel.pdfIn PDF document text
    • http://kmsenior.org/file/files/jarogiwekigaze.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/54096357991.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/20493337807.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/35823817435.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/48694331889.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/lagigumagenisus.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210914181331.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/xekonoxosebama.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/setipof.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/82990545292.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/58e2f225d8fe445d00c942a9d38031cf/noxanibolulajukilesuw.pdfIn PDF document text
    • http://capital96.com/userfiles/file/54636402987.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/nuregobedimakoze.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/tigaliranijoxiduzudotati.pdfIn PDF document text
    • https://33mobility.net/uploads/files/babunelide.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a8e00a8c---86394075321.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210921065656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+setup+ip+addressPDF 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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16536 bytes
SHA-256: 906fffaa0c4b7e6bf71d700bc68a1a7ed9cbfe3049786ed1d9e599fdfb2a130c
font_02_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 10412 bytes
SHA-256: fb2345402b6bca4b1ec9ae3cba2a37017f13c7c369985c7621c2d32f7a7859e0

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