Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf58f72fbc6ee36e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea4ce484fd63dfc074ffcc4b09c313f8 SHA-1: eb1aae36f35f2aa3dfe898ba8413f351fdeeb13c SHA-256: cf58f72fbc6ee36e0704d056efa917ca4269e5eda1f2cea2472cae60c0a93fe3
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded links pointing to various domains, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a deliberate attempt to create a link farm on disposable hosting. This suggests the primary goal is to direct users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hglobaltourb2c.com/FileData/ckfinder/files/20210910_BCB0F7ED7B092719.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613100cd41729---85382887655.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/86894584011.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/xusudavexuxum.pdfIn PDF document text
    • http://ruresept.ru/files/file/dipudisi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/falodewalejafizisixiriron.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/lidedetiwewepe.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/95513623862.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/vubegokotunapuluwite.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/karugile.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/dejemisixoji.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/74017697306.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/zolanixumojikabisinijod.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/10094880304.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/77446044757.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/bifed.pdfIn PDF document text
    • http://kftchem.com/upload/files/92249013663.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/katogimipadosowo.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/64408133349.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/varelodowazeza.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/tefimosiw.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tufider.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/tanavebemam.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4df012d0d9530019d2fe5404c41851a/65609792572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+mobile+korea+2020+download+apkPDF 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_off0000c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 16504 bytes
SHA-256: 4b408a5a14327798bdc6c6fcdf8d4f869f110c65b9f6c7770fae30c7a9cbffd3
font_02_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 11132 bytes
SHA-256: 0a7eeafe936ba471310339e55a619c7b1058ff125b601492f892aa46bb6f3627