Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f93b65a29868e3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 01:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de6bb315f523a39ab9b32e6e67d220dc SHA-1: 32891b34fe9e7e5d2d9cf8a98725fd9a4e599005 SHA-256: 70f93b65a29868e38d98037889114f42c76425e8c29dc430c9f64662cde0992b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful external sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sirmamedia.com/ckfinder/userfiles/files/80710731406.pdf In PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/62502838838.pdfIn PDF document text
    • https://kede.org/userfiles/file/rerowazotajezujudirote.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/12868827388.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130403c017e9---40965210311.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vosonowipajom.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/5930479759.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/95009662253.pdfIn PDF document text
    • http://kotolantopeni.cz/file/25947434368.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/72769532199.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314748f3d5e---98267404312.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/domajaxajurepu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/23337455164.pdfIn PDF document text
    • https://wecareprogram.org/images/file/61912382226.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/18198033622.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_112214_116.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/lunapat.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/13837587872.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/roxitabup.pdfIn PDF document text
    • https://megashina24.ru/files/files/67658724706.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/3872788391.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/dipunovux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=roblox+latest+version+mod+apk+unlimited+robuxPDF link annotation
    • 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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 11100 bytes
SHA-256: acf9ab1e008dc09d5aab67e64292a6abd03f5374cc39ddeedb09a38dd57374b4
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 17700 bytes
SHA-256: 51b9a2ce6c218aa3f25fcd7a284e4c60233dd7171dfe29c1bae572fb2fc4dee2

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