Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d05f59c04d2acf9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-27 00:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95e4fb4205c36210100debe569fb2ace SHA-1: 5792540bf60cdf69bed7c57b0727da7f7266673c SHA-256: 4d05f59c04d2acf9d43c114e8e18a49feae135cd051ad6067d499b552ee412ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tdfstore.it/file/42023018025.pdf In PDF document text
    • http://studiodelcorso.eu/userfiles/files/pugodozutewuxaduzo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/laralipabewapegumivil.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/23835863156.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/88342303514.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/rizoluradadefo.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/70226760612.pdfIn PDF document text
    • http://asvpp.fr/pdf/39932347167.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/jimigagiwemorugetap.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/1783768774.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/sokomiborevenaxepen.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/12983272583.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/nutuvokugoka.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pp987rdp84bmcmqkpo73d9taji/nolepib.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/xinizomenovaxojutopo.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/tamepusamizinojiwofu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614588156bcc4---vimapegujejariwamigove.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/vujiwopexegasufulutax.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/loludafobodax.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/73348630688.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/29859411261.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/tisivaxowozije.pdfIn PDF document text
    • http://freeorden.com/media/file/wodune.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/vanufetebaduribakuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=soorarai+pottru+telugu+movierulzPDF 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_off0000bd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 18848 bytes
SHA-256: d2d3967c8591097d1aa20c0423396917952660bb701cf25e70e7e60a58077e77
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10624 bytes
SHA-256: 18d7a08319ddd83246ed074b882a077408b494cd36a86d31db5c854cd95adcca

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