Malicious PDF — malware analysis report

Static analysis result for SHA-256 60932e4586292822…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 07:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bd934bfa90fd31fafb92bcdf8118373 SHA-1: 71e29a083c283c01ec9a1f9724486c85c251b3d6 SHA-256: 60932e45862928229b1ce227da553ee1981161d92fcef352f84fd6980a7be1b4
174 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript and numerous external links, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a second-stage payload. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to a suspicious PDF file, suggesting a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=scale+d+major+guitar
    • https://garnet-medical.com/userfiles/files/31580472174.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/gedasibitemitukutelom.pdf
    • http://bilateralmatters.org/userfiles/file/solutugefakumerojog.pdf
    • http://olympusflights.com/files/files/setilositumufideban.pdf
    • http://slesnick.net/userfiles/files/texenenedamazebibumusoka.pdf
    • http://medrea.ru/upload/files/23961969158.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/85783733720.pdf
    • http://baovecongtruong.com/upload/files/kezapo.pdf
    • http://gearcon-eng.com/file_media/file_image/file/kijavagezugejoxuba.pdf
    • http://huucodatlanh.com/userfiles/file/tuzikudogofixesokor.pdf
    • https://songhong.info/userfiles/file/penukibenawodepun.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/novaxanajukovijaw.pdf
    • http://cheumst.com/upload/fckeditor/file/kataradoxuxuwomo.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210926121809.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/tarimolib.pdf
    • http://alarcon-v.com/editor_upload_image/file/wuzurapoxepexewakutoxade.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c16cb4f67c---nubujolekikixijufejekebiw.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398646b8b27---lusef.pdf
    • http://0965818789.com/CKEdit/upload/files/vurapofidoxifunamaxuguse.pdf
    • http://raegcafe.com/uploads/files/nujesegibisifipevafipajep.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/16738333123.pdf
    • https://mavachhaiphong.com/upload/files/68535995819.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/wolixulerukoz.pdf
    • http://gayaarchi.com/userfiles/file/20210918164459.pdf
    • http://kechengchem.com/upload/files/xovizokum.pdf
    • https://majubesar.net/contents/files/34978088315.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_off0000b5b6.bin
3c35865f3711aa7ae7287181b93f17fc92c32d6134646b4b1657a6a3b9413a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 15568 bytes
font_01_sfnt_off0000dd3b.bin
dbb0fceb3704a036826f8b296a4b27dd3d3588378e2454625f1f84fea9827627		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10748 bytes
font_02_sfnt_off0000f5bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 16792 bytes

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