Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7e03d574a0899e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 08:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2587e5143ad6978e3fd9fb288fb16a57 SHA-1: 4e7d52bc6f092369d34fdfabccf868aba930fd32 SHA-256: ba7e03d574a0899e09d4147c2a0499f4cc2cd2165ca2353014be36cd0a0e75ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=download+from+itunes+to+android PDF link annotation
    • http://jongauger.com/userfiles/file/dadotevozevezovuzogoxe.pdfIn PDF document text
    • https://fong-cai.com/upload/files/migudixijakusa.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_1D3B7E65FBC7C573.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/sosetupuzup.pdfIn PDF document text
    • http://e-menu.hu/editor_up/koladogamepugiviwakapa.pdfIn PDF document text
    • http://sro52.ru/uploads/files/logopuwovorubipaduw.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/bajudugezibopig.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/28738777402.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/vawidamojiserugezokopibo.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/29034844653.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/49124751450.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/dufijubodidodozubomufut.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/gubelerurenu.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/sazutukaxula.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ebd90266---66656124124.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/67016989361.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/danufadopebugozajep.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/14443983806.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/wegekubi.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/26263281124.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/26812220532.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/burefidazixokexijaru.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/xodagajoredelafodoluzu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115e083e70---sanovo.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_off0000af5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 10700 bytes
SHA-256: 7334075cd6098641d933b83d40b3ffbcb7dddbe80a52aab68c4a915075db53be
font_02_sfnt_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 14384 bytes
SHA-256: 236ad9a2c5d0029f54ba4efb42794058584c00efac66f059a2308bf9f541f8bf

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