Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ea18c96ed659e2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 07:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2214473405bd270fdb89eba53c9f28ab SHA-1: 30ed7113635a91f0ec6a15315b6422458ea4104f SHA-256: 66ea18c96ed659e28f6026e71a89c22bc32a6fc8760da5998b226b710b8a2b1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the PDF's primary purpose is to act as a lure for phishing or other malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=the+bachelor+japan+watch+online PDF link annotation
    • http://accronline.com/userfiles/file/vasukadigotupujudikowexu.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/75556140768.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/74828463979.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/bukevifakebeje.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210906_232848.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/komesexob.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/wobewotononatoxab.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/43080b86982f54729722ad3e99c62a18/lazumapibumerij.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45743525774.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/30443314541.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/jikimagawebipamoz.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/fivonuzakifixubaf.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/52266733415.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tikijiwenafadujofo.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/60328644779.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/62451773511.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/zutugekemovatijafujazan.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/tafolotalut.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe87eafe4---2090017364.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/kenavekajalizabedud.pdfIn PDF document text
    • http://fullx.net/files/69608590443.pdfIn PDF document text
    • http://apvn.info/userfiles/file/70447672490.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/8251044519.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/zebunereresuzojob.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 17508 bytes
SHA-256: 8cd9209dc6585587362147fab3c4171471f88d432fc55009ade01bc3d62dfd27
font_01_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 10620 bytes
SHA-256: 1d11c1aff1688d86d3b5071fefe6a54febe35c36dfc1b6933f5c290cf1756a96

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