Malicious PDF — malware analysis report

Static analysis result for SHA-256 2273ae514303d006…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 19:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf0d523d0d637a5f7c30db90b8e44c5b SHA-1: ea600f37a8d4d419174ae5e888a9199ff51fae46 SHA-256: 2273ae514303d006b173f02f02b8c6ea0e2d7daa63160e479ad6712046e24b0b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to sites hosting malware or phishing content. The embedded JavaScript is a common technique for obfuscating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=download+clash+of+clans+mod+apk+unlimited+everything PDF link annotation
    • http://unitec-egypt.net/userfiles/file/tizokoditiwizarulowo.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/tagedelefu.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/070358331678.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/89119818308.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/tulademagufo.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/14196108970.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kelufuzujigedaminarano.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c65b3ff9e---50141764392.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/lofezotobumexikarasasogi.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/gofifoxewatisepidari.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-18/20210918151941634952.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/7991760288.pdfIn PDF document text
    • https://afma.pt/site/upload/file/niruxigavotejeto.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/zawele.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/wejejibilowutewe.pdfIn PDF document text
    • https://airxps.com/userfiles/files/jezabipexezukixagebu.pdfIn PDF document text
    • https://renetravel.ro/images/files/67547201955.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/6910220812.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/87525347615.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/71429018441.pdfIn PDF document text
    • http://iviltra.lt/images/files/97626676629.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/50247977229.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/17575579559.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/ridiwawi.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_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 16056 bytes
SHA-256: 5f949b44b05be0ab28f024a60cca0f0246161926a74c059545b08bdff2c99b2d
font_01_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 11528 bytes
SHA-256: dc885dfb43f3fa7281d9fc249f7743af16fcaad030d9cc971e90cc05433abe31
font_02_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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