Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c43595cad865b67…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 15:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81eb661a0231e8ec987586701010b719 SHA-1: a5665bb60aa9505bb08b7a438968e4897c100b7b SHA-256: 6c43595cad865b670949a8a6d2554ab9d0339271a78bee3b92ea77e71846ddbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also includes numerous external links, many pointing to potentially untrusted domains, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd7e084bc---difuzeziwodegajurimorarub.pdf In PDF document text
    • http://lso-msm.fr/userfiles/file/rosikilonofizadixiwul.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/68591959592.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/molufizitu.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/91981069790.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/89551474585.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepet.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/10245127884.pdfIn PDF document text
    • http://hiniceshine.com/upload/2303795540.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/79418224292.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/pegudodiw.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/85935706259.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/26514020044.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/7990167491.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/nerurakakawelozazesobox.pdfIn PDF document text
    • http://jfe.hk/userfiles/julagibilaxowojeto.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/relomusobepi.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210906200919_1991196618.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/44831887297.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/15626100919.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/vozufudadofonofuwid.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/92119658394.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gagewa.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/98149143747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2kit+consulting+screen+mirroring+pro+mod+apkPDF link annotation
    • 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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 18272 bytes
SHA-256: 0b1a1ee391ed52656974e8ceb44f091bf04ba4bbcf3352aafd1141168d2c109b
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 11072 bytes
SHA-256: 05d81b425750b623511afbbea59fc87a397310a64883ffa59c2d548bdbc86bac

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