Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6228caa76169148…

MALICIOUS

PDF

74.3 KB Created: 2021-10-06 23:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d07699fddab5291d9ae1f253e2b05a0d SHA-1: 4adbf0bdf285d9f20631066206cfe12296a094bb SHA-256: d6228caa76169148d4adb004ccf7bf5b1ffbf17acba291ef0fad00f7a0c4ef47
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 sample also exhibits characteristics of a link farm, directing users to numerous external URLs, one of which is flagged as potentially malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gamjagolla.com/uploads/files/pokuriduzejobasoviv.pdf In PDF document text
    • https://nepalonetours.com/userfiles/files/mipupaguk.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/58856912039.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/12425024567.pdfIn PDF document text
    • http://fnb-concepts.com/images/uploads/files/dexavejoxumatuko.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/259090bb2378dfb5d977328c8b4da6e7/86002118935.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/12894673636.pdfIn PDF document text
    • https://vestol.bg/files/file/dolesulubabomu.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/kapuladupudan.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/99435612449.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/pusuluzixoxekem.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/vusujago.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/zoronixasenekofubo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/bedidumalosadu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/41399160410.pdfIn PDF document text
    • http://alcantara.cz/data/file/44229531134.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/panatilevijezasafibu.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/97751814366.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wixubiginozaguzomaborojo.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/57962433568.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161485611922ab---kuvetapanal.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/968253338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+zero+ping+on+xboxPDF 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_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 16544 bytes
SHA-256: f925b7f7f4809777ba76654c20dda17867cd6ef637307f3b8b653353fa493279
font_01_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 10428 bytes
SHA-256: f4b0313c65adfa6586e0ffceb7b22aef138e2fbc521d2307680cda946b264e89
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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