Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c35fc5be831e6b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 05:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f752e9d41f6d331a255b049598d200e SHA-1: 7b0a02da5c6081ac3f2639b4ee8ba22c737eb701 SHA-256: 27c35fc5be831e6bee090c7f6a977096ae5c8921a0c4ace7654ea09fa8d27cf8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to potentially disposable hosting, suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature, indicating it likely serves as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sanmorales.es/userfiles/files/wawutozofalijake.pdf
    • http://circuitoinsulargc.com/documentos/file/guridiwatujixaf.pdf
    • http://vesimport.ru/userfiles/file/39554046722.pdf
    • http://twtipa.com/upfile/files/2021/09/05/widopa.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4158cb92e6c91e9f12b356b62047528f/18851725478.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/27855408603.pdf
    • https://adproissy.emailingmanager.com/uploads/editor/file/numajugopan.pdf
    • https://tatvan.in/userfiles/file/juluwunasuvosewumafapa.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/6538159493.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/loxosu.pdf
    • http://paraglider24.de/pics/fotos/1/file/68363064558.pdf
    • http://telecycling.org/files/file/93590494175.pdf
    • http://hondasushi.com/uploads/files/24110738680.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/73830094832.pdf
    • http://fioredda.com/userfiles/files/48794427302.pdf
    • http://condominiobrisasdelnorte.com/userfiles/file/zigoxulirulepijaxib.pdf
    • http://werder-ritter.de/UserFiles/File/10647279903.pdf
    • http://mibenjamin.com/userfiles/file/9314632118.pdf
    • http://elcolono.net/userfiles/files/nogesusina.pdf
    • http://casadiriposomarsala.it/userfiles/files/denizitomuxola.pdf
    • https://lotusmarinevn.com/upload/files/10998200836.pdf
    • http://tiszaladany.hu/upload/file/3212874519.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161441b5a6fecc---35221908554.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=30+rojullo+preminchadam+ela+full+movie+online+free
    • 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_off0000e0d3.bin
1247a95b2261247d4d7fc9497ab4e06855eb44ff78c506b502e1309f6d37fce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 11112 bytes
font_01_sfnt_off0000fa6c.bin
8e370d440fda5d18db6009dd73451fa6a4627adc18f07b7b9afd6817fb597724		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 19020 bytes
font_02_sfnt_off00012c03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 16792 bytes

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