Malicious PDF — malware analysis report

Static analysis result for SHA-256 338d3ae84d738adc…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 08:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6925515a5fbbba4f7c8c3e496c9915a7 SHA-1: 4ffb5229cedd48669d56f3f25f3702f747f79400 SHA-256: 338d3ae84d738adccdb531a8958d786fb5997d2f675afe18145a0884af97d393
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ud-hobby.com/images/Upload/file/36831494148.pdf In PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/takogeji.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/boxevij.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312230cdf95---32323538416.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/57170179437.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210916_5565D35A631CEE20.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/42442637482.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/burotefujanaluzunigabu.pdfIn PDF document text
    • https://granitnet.hu/editor_up/6150588296.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/73519300369.pdfIn PDF document text
    • https://redac.ch/upload/26236239148.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/larovawefokugawibumo.pdfIn PDF document text
    • https://ikima.fr/uploads/file/16196873272.pdfIn PDF document text
    • https://sadex.pl/fck/file/zaliwexuvojowe.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/26419897666.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/nukoripupolekugejafolu.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/89753794940.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/lugurolojideki.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/28521283129.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/23463144182.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/bodebakevak.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/3941968966.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f33f02f33---jafakudukaravorulaziral.pdfIn PDF document text
    • https://luminex.pl/upload/file/fidakupun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=driving+games+unblocked+66PDF 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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 11184 bytes
SHA-256: 66831f7a278bd8e1e11916282e4b76a410bae22408bb928aace800fd39fcb88d
font_01_sfnt_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 17328 bytes
SHA-256: 70bf38bcb37c6743b97bf3ef55c2268fc9b1e51e2d02db312863dec4618e58f5

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