Malicious PDF — malware analysis report

Static analysis result for SHA-256 c729fc9470dc061b…

MALICIOUS

PDF

67.0 KB Created: 2021-09-27 09:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e4d4cada579d2d7a05c3fb9526cbd2f SHA-1: d404888754324eebb139fcefeb5ecc19b5f57a5d SHA-256: c729fc9470dc061b6e4f448bdc06b1113fde62555c234ef816699ffe5f5f029d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only content and embedded action triggers that redirect to external URLs. The heuristic 'PDF_IMAGE_LURE' indicates a typical phishing shape where a screenshot hides a clickable button. The numerous external URLs suggest an attempt to lead users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=best+hentai+games+on+mobile PDF link annotation
    • http://rspon.pl/images/wyswig_images/file/vavetiz.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/11679996722.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/gopolesutejeb.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021917254166285.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/binijatuxesitavemit.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/palivopofupezolodexomo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sovotozupuxojarasonuros.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/79572380859.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/75327730545.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/xejerabob.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/33101383075.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139717ff30---94093385744.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/budusad.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zoxifunikov.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/nojevowumajoworugisug.pdfIn PDF document text
    • https://mangallagn.com/images/file/sakidakatomepokozojabe.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/xupazanomu.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/90341594186.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/25699499208.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb041ca23---91860135478.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/nomofopugugobov.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BF 14172 bytes
SHA-256: 4923695f3c990f66547cfdc84a62280d9a4a6baa76a9e02b3e1a5e08f50923f5
font_01_sfnt_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 10648 bytes
SHA-256: f60631c9f57bfc015e416004e6b5dae12378afdf1ce53bc36d03272e9cfc5d10

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