Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad551dd6bbfd8314…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 15:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 128e8fae9c1861550c39e8e887eb95a7 SHA-1: a62aa20a4366c66cc1625aa55909ff6ec050b6f3 SHA-256: ad551dd6bbfd8314cf74ddc3b5b6aef7e240d272336ebec57eff084bf4aac9e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting, suggesting an attempt to obscure the ultimate destination or distribute payloads. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution.

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 http://meyergarden.com/ckfinder/userfiles/files/vumowojolanabimut.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/vukutinewefesevatabiv.pdf
    • http://campbellelectronics.com/uploads/liboxot.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/nuwobonijuxuwet.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e40ffefe5a---wajadomofijazapas.pdf
    • https://aquarell.ro/userfiles/file/41186339602.pdf
    • http://gmicropilotes.com/uploads/files/nivezafemuj.pdf
    • https://charteriraq.ir/basefile/charteriraqir/files/30858268204.pdf
    • http://carshopm.com/js/upload/files/kufovataw.pdf
    • http://dar-tom.pl/userfiles/file/bumebuvuwuji.pdf
    • https://pikhospital.com/ck_uploads/uploads/files/38490342745.pdf
    • https://vipbeachhouse.com/uploads/editor/file/82779437919.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306818d75ac---goniwebanusi.pdf
    • https://iskoruma.com/upload/ckfinder/files/zuxufumuturalatenina.pdf
    • https://desmar.cl/gestion/admin/images/upload/file/47285453652.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16155a66d0513b---sasisifejasemozu.pdf
    • http://aisne.proximeo.com/ckfinder/userfiles/files/zokoke.pdf
    • https://cardolf.ro/files/fatusuxazifesexisoxuros.pdf
    • http://resetimpianti.it/reset/public/file/pexulamolowifem.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/29558892456.pdf
    • http://inistor.com/ufiles/files/91919896181.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/84686095872.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/wajorebek.pdf
    • http://www.salpasafarit.fi/tiedostot/files/wivufovufijan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=madea+goes+to+jail+play+2006+123movies
    • 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_off0000b4c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 16792 bytes
font_01_sfnt_off0000ccd7.bin
5b01c5b562616e255b02a1a188bce6218b9928cf567da242c730abd1676f1d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 17208 bytes
font_02_sfnt_off0000f7fe.bin
0e46cdfbb9b3e720aef5159388d8847a889940221cbbad9b7c0c1ab67094eef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 11468 bytes

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