Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b7234fd1a3866f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 11:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 67fc1b2bcca0d238b5625d6ecb17ae82 SHA-1: 17e71d60ebd13293b3a4b6b571ed26f0d85df357 SHA-256: 99b7234fd1a3866fe8c8324da268559621b5bda40dca0cf524aa5d137f12d457
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=alpha+guns+download PDF link annotation
    • https://nabijdefossa.nl/upload/files/54217267830.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/11365167005.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/19054787895.pdfIn PDF document text
    • http://spharma.ua/files/file/73776494085.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zuzaxowapidulid.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3662cdf9---fixumumatuwudutagexij.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/27541409101.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/86825308322.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/butoximaruwi.pdfIn PDF document text
    • https://anjingliar.com/contents/files/pifurukojosakilajesajela.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/xevutemezediziwidemokewa.pdfIn PDF document text
    • http://chinalabware.ru/d/files/22125860104.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/10062273325.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/vawefelobunimudevoga.pdfIn PDF document text
    • https://clubon.top/uploads/files/tirulirijigumedazotur.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/71816310122.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/caac6c85071bb8cd7c39dbbb24fa19ce/zofezefejexoxar.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/fumiw.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/41083461543.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/20628676185.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/lewudiraze.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/92318585730.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 10416 bytes
SHA-256: 50cb730c8c20d3405230d497f44120e85320ab0780ba486de29eebb50daf6c4c
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 17688 bytes
SHA-256: 6b79ecc7520fc9dd2b38a6f60a9962896e9b230093dbd2fc4a405dd179c1fdc9

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