Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c15d24d58f525aa…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 15:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5aefc2162b08b04efebd1beb567df312 SHA-1: c63e332556b1c54c5b0353b7215e017dce23b6c2 SHA-256: 6c15d24d58f525aa9a6020d7382594e69ea5d24485962d8375ebb29e9b042ec7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=16+tenses+in+english+pdf PDF link annotation
    • http://kukdae.com/files/fckeditor/file/72318876079.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/kirexov.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/46893528596.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/47654389865.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5af5ce01b---joverogukasufabare.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/ganebuxifado.pdfIn PDF document text
    • http://hrudolf.com/userfiles/66212676605.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/kawakeradufonugofi.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gubutosijadeloki.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/korodegul.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/2481406637.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/18109255334.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/1349166521.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/21946114973.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/91779813410.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91025923259.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/81103176722.pdfIn PDF document text
    • http://coachhouse.info/assets/file/mural.pdfIn PDF document text
    • http://handgun.ee/media/file/70347212370.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/3987840836.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/migokesizotefakan.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/99261102947.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/difimatevoti.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/84325916226.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/nojexobuserojij.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/4476660068.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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 10516 bytes
SHA-256: f73a0256c5d71fdd927fbf589d97fcef6035ab91497fbb04b5fb7aa8476d570f
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 17716 bytes
SHA-256: 25483a0c4277df35cd895eb10f8b62f80bb52d71330a103de44b78e8e0091f4a
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1