Malicious PDF — malware analysis report

Static analysis result for SHA-256 db785dda26052c36…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 13:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4522f26f9e05e928c725736950b0832 SHA-1: ffca3839c0771016a2a89a7f5b38d62c16b09df3 SHA-256: db785dda26052c363f8eb7773b8c88a3336b84af06e4ea4e507b76c0a3f75554
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=wellerman+roblox+id
    • http://enjoyisagenix.com/ckfinder/userfiles/files/pinudobetidugubobaboripa.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f368f854---27440822603.pdf
    • https://otterdisplay.com/userfiles/file/zubasufu.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73615916625.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/mexuvogegitopizo.pdf
    • http://autoklej.pl/app/webroot/media/files/87490581999.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fuputos.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628f2ca41c---ruturagipaxuzesisukiremo.pdf
    • http://baby-daycare.com/uploads/files/202109031357083761.pdf
    • https://idosekotthonaveresegyhaz.hu/files/files/94831166250.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/14214146749.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/pibonudolorisixetizor.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908002049981986.pdf
    • http://metrominicabs.com/survey/userfiles/files/levoxobojamujimux.pdf
    • http://nhakhoauytinhaiphong.com/upload/files/tukar.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/65253173452.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxarikasasoleva.pdf
    • http://ingatlantv.tv/userfiles/files/12283068369.pdf
    • http://vigen12.com/userfiles/file/wafosuporekesesofuvine.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/xuforapezexesexedot.pdf
    • http://castrolmintabolt.hu/images/upload/file/65337688214.pdf
    • http://z500.si/files/26985261655.pdf
    • http://imosa.asia/uploads/files/202109040849241422.pdf
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/43656524212.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_off0000b63d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB63D 16792 bytes
font_01_sfnt_off0000ce54.bin
4a2607050d8d016dcb3e7e9637f224b10188bb8755240af8bbabc3f95e4be081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 10380 bytes
font_02_sfnt_off0000e5b0.bin
4cb3ec3006a200c95ac91e023d79520b374c52af53c7cc3972f1a74b4fc54199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 15876 bytes

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