Malicious PDF — malware analysis report

Static analysis result for SHA-256 224395453ffd5783…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 16:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f25dae4b5a135d3c711168e3912b90d SHA-1: c33c239f27ef87923f3bd88861e0e402d454ee35 SHA-256: 224395453ffd57831bbd868f175f069d475af56047222f7a9b2f3f1fcad963b5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of external URIs and the 'SE_URGENCY_LURE' heuristic suggest a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a trojan or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=roohi+full+hd+movie+watch+online
    • http://kaie.org/userfiles/file/20210915185420.pdf
    • https://tiemhoamo.com/data/dulieu/files/37364738083.pdf
    • https://dailyiat.com/html_upload/file/7902815323.pdf
    • https://blueparadise.pl/userfiles/file/71652462231.pdf
    • http://onelove.cz/file/44597891042.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/21660547800.pdf
    • http://panteres.com/files/files/zaxoneturitigubenubij.pdf
    • http://frezerovka.by/images/fxeditor/file/dujuwaxipanawenoviwonuxos.pdf
    • http://restauraceeverest.cz/userfiles/file/neseselajin.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ddd9dac6---59999299934.pdf
    • http://ghibms.com/userfiles/files/likurux.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/wunejenorigexokeliw.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ff975df99a3a732c8d4c8af7175e1c93/40055530262.pdf
    • http://hiniceshine.com/upload/15327588592.pdf
    • https://marosme.ro/hirek/file/16561463583.pdf
    • http://dezmaster.com/userfiles/file/11431025112.pdf
    • https://npkfertilizerproduction.com/d/files/64400627602.pdf
    • http://musclecar-taps.com/js/upload/files/gesodaludumokevun.pdf
    • http://zatexpress.com/upload/userfiles/files/lujunafakex.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/dozofeledeg.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/97609334996.pdf
    • http://otestmanager.org/club/data/userfiles/file/20210904142103.pdf
    • http://www.zywawiara.pl/pliki/90367920316.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/98125652012.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/zaduvikafuvemagujitumasaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 16792 bytes
font_01_sfnt_off0000f3ff.bin
2dbc6d3a3451fe8be106ce643a8c3d179a89e0faf9be66baace8e6f553d68273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 18260 bytes
font_02_sfnt_off00012380.bin
3fd8f5069808994f704efaa18c79145128d3f7d7b1920200dcae11904d2b40f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 10772 bytes

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