Malicious PDF — malware analysis report

Static analysis result for SHA-256 123fcbf107dfd472…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 00:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec62d33e07264820e61c9dcb85f98d7 SHA-1: 16f47c12cf27714337de7d8e3af48e2f2f36f64c SHA-256: 123fcbf107dfd4722837b4b361f5dc05c14569b83654d9f50ce7c846932f022f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on disposable domains and use UTM parameters suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to deliver a second-stage payload via the embedded JavaScript and external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=free+robux+no+human+verification+and+no+anti+bot+verification
    • http://ashole.hu/UserFiles/File/kotelum.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/tilipopile.pdf
    • http://bellina.pl/userfiles/file/86468058554.pdf
    • http://isvpro.com/custom/files/11311878818.pdf
    • http://qianxish.com/ckfind_image/files/mesira.pdf
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/lumugonusekezabobetiwit.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2f2b34d1---zanekegudipowitetepa.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/zijediletarixutagarazix.pdf
    • http://ecohort.com/userfiles/files/66128542792.pdf
    • http://mikailang.com/userfiles/file/20210904130909_523459965.pdf
    • https://ckmandarin.com/uploads/7778872552.pdf
    • http://batiment-tunisie.com/userfiles/file/nanebumazokanulovuxavoruk.pdf
    • https://mai-avto.ru/upload_files/file/89845178931.pdf
    • http://cellesekorea.com/ckupload/files/67512339629.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/77ce6a1e480501787bca0477d2e73f92/meponozimiwebi.pdf
    • http://mdsalon.ru/img/lib/file/68449428438.pdf
    • https://egc.ecrom.work/syo/files/zakumowudeka.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/70063627976.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/konixitototajibinoduvig.pdf
    • http://bobmeetin.com/media/galleries/files/6139036911.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/rolutapiludeki.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/guvofazexelajaweno.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210908_230806.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebd.bin
c5bb68316a76e23ed6f760f5e0328e6dd23342a0bb288771efb3a94db716bcfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 10912 bytes
font_01_sfnt_off000107cf.bin
4530c59836248878115e0ce16793682748b776826cc01c0b78dcad42b0a7494e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 18336 bytes
font_02_sfnt_off00013798.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 16792 bytes

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