Malicious PDF — malware analysis report

Static analysis result for SHA-256 e250f5b32a35307f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 22:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f1fc93432a30d363d30abdb6fffde1e SHA-1: 615e17a771a284bcbbfbef5f5157429c1c8d980e SHA-256: e250f5b32a35307f892c56a11369c4b068c289011f066d0f5a90f587d49c07df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown-reputation URLs suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=how+to+get+robux+in PDF link annotation
    • http://schokofontaene.de/idata/fepuro.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/bodis.pdfIn PDF document text
    • http://yongqingtech.com/d/files/pizilokuxove.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/25065706729.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/42555959013.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a94d9e6f---4627545873.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/kufoligijamibuz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131a49d43be6---54846059959.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/givokasujuxivureguwi.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/puvukowu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/nurokazadedol.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109061037522376.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/42509503222.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/13370333353.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/17882221683.pdfIn PDF document text
    • http://santabruna.cl/upload/file/11739680270.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///41886657018.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/59313574963.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/13292733290.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/32439163234.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/besug.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/20111573536.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nutuf.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_off0000b115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB115 15980 bytes
SHA-256: a79918b9de1c16e910a2968d1e6b7b7a1ea842582669f94888ed4e831bfb3b8f
font_01_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10328 bytes
SHA-256: c78160405401fbd28df91f495fbfa786777c6f06bde3681b2cb3832e8b96e508

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