Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d0c93d6cd78c60…

MALICIOUS

PDF

75.1 KB Created: 2021-10-12 14:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 877f48f80ec7008dd245d6e67f597359 SHA-1: 6b280900d47dfba1d6e914d6c4444e2fdd7e61c2 SHA-256: 21d0c93d6cd78c60590a6884d6db4e547cb1e467877c7d5a1e76575d1968370f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high density of external URIs. The PDF appears to function as a link farm, likely intended to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=offender+tracking+system PDF link annotation
    • http://baobianhkhang.com/upload/files/17325479919.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/93535634208.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/25239410188.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/nopev.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/86542329460.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/53604678884.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/xadonupopixokelopugetavon.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/rasupimorozore.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/xavowobubesedig.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/28464362123.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/wuwusud.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/42899026617.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/88287155423.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/jaderosirinugivevuvog.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/l76oetqocul6u9prved42mppig/sasomilukikavudukumilopi.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/ginifaxitusur.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/96360998690.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92420657301.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/12371892989.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/pepuni.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/nejipabevuganevojokib.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/54312930790.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_off0000bedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 10884 bytes
SHA-256: 5cc82e01487f9a3dda6e6dbcc16a4bad91731d4da5c922ea69f81bab98aedd4b
font_01_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 17972 bytes
SHA-256: 0338aee19298e6c358d54ea92389b9128087095784173e016373355d5e0e900e
font_02_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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