Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b849b06a480efb…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 08:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55f384a1aac03fdc5415746fe7c50adf SHA-1: e30696a8db0934147849f5f5494aac2fb5c363b2 SHA-256: 23b849b06a480efb4684dc49b5e6ef1374c9cc7fd3fcf2d855e00cdcd0b7e022
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 within documents. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. This behavior strongly suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.willmarshelter.com/ckfinder/userfiles/files/duwavunijamodanujiruguw.pdf In PDF document text
    • https://luckyfood.itweald.com/uploads/files/613977c60a29b.pdfIn PDF document text
    • http://cl-pub.com/files/files/dujedamigip.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/nepexawatujesivasunaz.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/tipewuxikefitumumomiwix.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/xamakofax.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedb5ad80f---95564536210.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/tojawiliraso.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/38894460333.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/6712425417.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/raziniporul.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/juzarijulokimoji.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/feresuterepufusopomebim.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kulavu.pdfIn PDF document text
    • http://nprofit.hk/userfiles/55352918394.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/10363804943.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/bowejuvafejefafe.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/rageda.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/15141780518.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/zojowepinofupetivove.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/kamenapujamud.pdfIn PDF document text
    • http://creationart.hu/files/file/pabasafaketegoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=games+like+minecraft+for+iosPDF 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_off0000b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB829 10628 bytes
SHA-256: 591ff9f3f48a5ff6f1af60940f3504b6f07d9e584d6b72ff7019d9118a3ee429
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16408 bytes
SHA-256: 47f6551499a1d1a894b58bdc6270400b173e0ffa7a7841d789a590043eb1afeb

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