Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe8a71f0c0e585c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 02:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69559e39383936c2fa13a285d6b38cf5 SHA-1: a0f8ba2f22a57a80237e03b00bf65bf37c2a7611 SHA-256: 6fe8a71f0c0e585caf7e707fecd34d1b64aded4f03be7546886d2447997cede3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent by distributing links across many low-reputation domains. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to deliver a payload or redirect users to malicious content, likely related to the 'gta vice city apk download game' search term found in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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.
  • 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://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/85434622089.pdf In PDF document text
    • http://gsxr.hu/userfiles/file/miwigegurolelanomi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/foladesewetedowixij.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/xerifugagupobemuwutomezu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/83551119246.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/67763645193.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/gumavorekedamoxulutubow.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/jijolasatorad.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gerijujibefij.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/22070347289.pdfIn PDF document text
    • http://wdnederland.nl/file/nolejiwesopobavebuwarafup.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64126505028.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/donuvudiwewedumezixuzujok.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/61022175492.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210906204833.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/zujivizoxofopananani.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/9161908969.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/30934030583.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/xejimofananakaxajef.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7096f38d---pojabevuzulam.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zowexadamobupemusukub.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/fobuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gta+vice+city+apk+download+gamePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/71819578729.pdfIn PDF document text
    • 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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 10984 bytes
SHA-256: 11bd4aa15d123cba159c6036e7ac5457e019dcddd8b99c19478a061ffa791c9b
font_02_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 17724 bytes
SHA-256: d6cee247b7c4365f5916cc98a0e3ebb2e6975ce6f71fe4ad5bb05b5d52892aed

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