Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae87298127b86fa…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 22:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 49fe0f3ee82a099751bfba9e71b30f64 SHA-1: 33c37a6328656795f4830d8b80d5ebb90c420fd7 SHA-256: 4ae87298127b86facfcb848e6d7d7bdc8a81c2ae0eb5295696834a64b10ed3cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://natyabio.com/uploadfiles/31244493606.pdf In PDF document text
    • https://zmiz.hr/userfiles/file/31869170980.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/pifutapo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/81106461390.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/wejopi.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/sobameb.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/82647683842.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/40557911983.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/20358191602.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/desudajozijisegaz.pdfIn PDF document text
    • https://remini.hu/userfiles/file/gamujojas.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/31503070133.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/57061114687.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/88310564674.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/rutubumevilaverubupubit.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogabeputimikeresizamak.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb70b108f2---moxobusajakod.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xagodamafutiral.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/babusimokadiluwukara.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/38847534973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nfs+no+limit+downloadPDF 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_off0000af06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 17188 bytes
SHA-256: ccd60a79b52d2ac204399a07b46629cd965263aa13fa535d48101eff073663eb
font_02_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 10348 bytes
SHA-256: 846ac9274f5244c0bd0e98f31ea85287dd18134be9f160f9455b82cfc183e4e0

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