Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7640e26b1ff5247…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 02:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 877763b668e844da55c7a9588b2e4fce SHA-1: 2d1f3f9b344b512992ef0f187ce6225cda7ccc9e SHA-256: c7640e26b1ff5247388ca095c9250258e31dec84b92c02c0c8646f77599d8628
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The PDF's structure and the presence of many disposable links on various hosts point towards a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://queure.ru/uplcv?utm_term=the+making+of+an+american+capitalist+pdf PDF link annotation
    • http://appartementslisa.it/an3_Uploads/file/94556901319.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/56440471243.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/jegikuwusisaba.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sekenigebitoxig.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308beb1ecef---wogetapejexogukabilimela.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/godafolibemofopevijipaleb.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/pupevadasadapobawafobuno.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109120809047239.pdfIn PDF document text
    • https://thepainter.asia/upload/files/94120808025.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/nifisituwogamujitirodu.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/25240329389.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84505443692.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/21457737411.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/66809185552.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/44490140813.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nubedukuzofapi.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/12502115866.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/kosabotagizekubutifex.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/12919314891.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/66574259623.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6f044cd62cd80b5a7c1f7a6ca1260d0b/jirutodufexoduxepuw.pdfIn PDF document text
    • http://sungder.com/upload/wamopav.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_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16268 bytes
SHA-256: f3da37122c14a1f0659857cf71bf61d684ee43998fa493f765aa5e6654561126
font_02_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 11124 bytes
SHA-256: 79745e81fac186e4d7c0377473655c178722e4a5bc25e594ac3c69e6bd63bb09

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