Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f538496544f66cf…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 17:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ebe873005a46f2041cf96e73c6a1dab9 SHA-1: caf78fc3aa3f3a09714eaa1bb2b6a6a2616fe9da SHA-256: 6f538496544f66cf3dc640516efd0900bcdb817e20090ec6e8e75b8c53ed621c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malicious content delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using numerous links on potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://halmar.info/userfiles/file/gadaniguluruwe.pdf In PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/26021154443.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/62222137149.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/soduzepemomaji.pdfIn PDF document text
    • http://sartor.ru/upload/files/pokimo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/balijizenalopodefomite.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zuxarekisibukixedak.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/vavuk.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/sudaberubedo.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/namagepe.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/14929971208.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wemetexunivufufuzudabu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/68923002298.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613074ce64aee---kumowiparofagevat.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wopibegodonobekakuka.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/13395489398.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/90979000428.pdfIn PDF document text
    • http://cmtsport.com/pliki/12787783178.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/85102296689.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/dedujunuximimowap.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/53078938896.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/laxulamalixetaxafawex.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/ruxuwebu.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/nupimijuzezakujupimijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lil+nas+x+montero+roblox+idPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 16324 bytes
SHA-256: 154fc6d9d91969ead8989c5faaf292afdc31ccadc029228cd04f8e044c98f6ab
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 10608 bytes
SHA-256: 815df2305eba8b180cef20713033d8f2b8aad864f485ac38a975478b59342e6f

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