Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7e18c8507acdeb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 08:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df87b8118a176433f6b5ccec7372a9ab SHA-1: 80b304e6f7592c9d5dcefe8253d9c4fac0a133c8 SHA-256: 8c7e18c8507acdeb9ab5577f34d6fb1fb7f20fa581e366b25ed871ab8deae7db
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the PDF is designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 https://queure.ru/uplcv?utm_term=yaar+anmulle+returns+2020+full+movie+watch+online PDF link annotation
    • https://marljivo.hr/UserFiles/files/fidowowosup.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/lisebubafagakamokukewokaw.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/vebezukomole.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/32136839610.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/71972966655.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/fegejasisi.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/makososukud.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27d0e8963---jojakumuburasoxa.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/52493727740.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630756316.pdfIn PDF document text
    • https://12shio4.com/contents/files/63048481265.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/dozesekotejolelude.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/152104053.pdfIn PDF document text
    • https://wita.lt/images/files/14926065170.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/luzezakifijomuw.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/seronopexowepi.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/40131746032.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/52952061513.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/40315293183.pdfIn PDF document text
    • http://carszana.com/image/upload/File/miliwedutezewivawerojom.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa21aa2445---51531110854.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/39710179246.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 11076 bytes
SHA-256: f7bc6dab565166ea170536f11b9da9cc8cd90ca770d99a410e4e844bede1461f
font_02_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 18080 bytes
SHA-256: 3d8cc8f5587c06587e4a136d1841fa69e10e990050e765e358aa3b698c332e17

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