Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6c39ffb0270d95…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 08:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90090467fdde7d667715651ac2c2d653 SHA-1: 7f49e52c3033580c85f07326caa3d11962814a5e SHA-256: ce6c39ffb0270d95036365006a576636b1d6d02b1ecc670666739a88838f126d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded URLs and the nature of the link farm heuristic point towards the T1566.001 (Spearphishing Attachment) technique, as the document likely serves as an attachment in a phishing campaign. No scripts were extracted, but the overall structure and heuristics are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=gpu+power+calculator PDF link annotation
    • http://neteyes.eu/editor_up/88942573879.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/49347997683.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/42593654162.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/nemorafepuniwutumumelafow.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/24576489265.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/kizoxi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2e69f0e02f0f8b3aaf0cca40d415a158/9844021006.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tokitojuxuwe.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/kinid.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/38566818021.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/24841274114.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/zuberewutarejuvipa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614243391e266---zawaxekukazex.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/kudaperig.pdfIn PDF document text
    • http://beijingteye.com/upload/files/59301324967.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/62807248879.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jolusojiwefijegilune.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/72941826903.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/40948189340.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210901224332.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/84999695313.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/47322041182.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/68925119443.pdfIn PDF document text
    • http://byecook.com/ckupload/files/gedub.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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 16760 bytes
SHA-256: 084361122e6c317cfe2dd59cf2b7137b95a363902b35b8adad79fa0c2808725f
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 10228 bytes
SHA-256: e99365c0d1a5889783a480c39ec01ad3c8484ee64144f4bf0867bf0615ccec59