Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b01edda352fbb56…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 09:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e2bb65b70e48df49e6bb1e3c2810e6 SHA-1: 3b691cc831674f1da7969823485052b40429b84e SHA-256: 6b01edda352fbb5638080f0e9e79a1a0bd84b95de3cb0365d8b18ff93f2e4299
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of external URIs and the overall structure indicate an attempt to direct the user to external resources, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://krisoc.ru/uplcv?utm_term=flash+led+apk PDF link annotation
    • http://dichvu12h.net/userfiles/file/ruguzugawutesosilax.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/27680427141.pdfIn PDF document text
    • http://destockbaby.com/ckfinder/userfiles/files/kuvosulapub.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15335773a---19160716561.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/76325735404.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/sefaxutanorizezenoropef.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/89396746741.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/muparubilubopik.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/92316595404.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d22c362d---jigomasidonegag.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/biperede.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/96199551432.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109100303541420.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/78609837417.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/zorevijidokaxovemejasugab.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/88122747928.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/19681418244.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/52041557905.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/26884930690.pdfIn PDF document text
    • https://ms1oke.com/contents/files/gavizivifurekatoset.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/kazosuganininesifinor.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/17653770241.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_off0000bd45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 16792 bytes
font_01_sfnt_off0000d55c.bin
48661c8d84e18ff595749bdfb9c09c68118d1a9881b900f2685d5801d2fd3f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 10044 bytes
font_02_sfnt_off0000ebbc.bin
0233aea2178b158958f78314b3a16af99ae71cd503c22dd817b05929ce2e9022		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 19940 bytes

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