Malicious PDF — malware analysis report

Static analysis result for SHA-256 295bb36001ac5459…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 05:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 041ef5316e33912adc0541441c84a792 SHA-1: ba01265c810b00b2d3d8fad688ff4cc324f061af SHA-256: 295bb36001ac54590166667af3698525a63a709811bd0152d78bbae9f85bf909
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to potentially disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.awakohchang.com/image/upload/File/543765013.pdf
    • https://vzglavniki.net/data/file/66626114896.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rutag.pdf
    • https://saatyapi.com/upload/ckfinder/files/mozawadufuserededilaxa.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c417037c---wujebuferilekabifivi.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/telomiwopuxewep.pdf
    • http://sedaciesupravy.sk/media/file/29021781557.pdf
    • http://shyjjc.com/v15/Upload/file/2021961833171414.pdf
    • https://telliogluhukuk.com/userfiles/file/85536287365.pdf
    • http://beautybybelief.com/admin/images/file/11908670833.pdf
    • https://balaji-technology.com/userfiles/file/bofabajidagiladubilagut.pdf
    • http://kaitosushisb.com/uploads/files/19864244159.pdf
    • http://hasdeu.md/data/userfiles/files/6724737864.pdf
    • https://dgssu.com/upfolder/e/files/20210911083224.pdf
    • https://sklepbonus.eu/userfiles/file/92137786681.pdf
    • http://angarakshaksecurity.com/userfiles/file/90298166799.pdf
    • https://prawobrzeze.info/userfiles/file/goxaxogan.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/30943863540.pdf
    • https://vinniescustoms.com/userfiles/files/zusivijokepapupev.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/9977395134.pdf
    • http://dotbamboo.com/file_media/file_image/file/71717690238.pdf
    • http://tw-sincere.com/upfiles/editor/files/9813762026.pdf
    • http://toyotaprius-custom.com/js/upload/files/tatakawox.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff53e81672---28043357074.pdf
    • http://enovosti.info/ckfinder/userfiles/files/pewipozalumo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=xender+old+xender
    • 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_off0000c151.bin
38bd200eca91a5b293b162ce9fa9fbb54577d31a1f0d6a3240bef5698ca978a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC151 9832 bytes
font_01_sfnt_off0000d6e8.bin
9343de7644b71592aa9489a0df2117d25c960472f859b0d5cbdf059ff260819a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 17180 bytes
font_02_sfnt_off0001034c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 16792 bytes

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