Malicious PDF — malware analysis report

Static analysis result for SHA-256 c006bc7f678c7062…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 11:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6eef88b2755ca06d000b8e6b7b1f6016 SHA-1: b4388f71902414a72ad4920094c5483f21ca1f05 SHA-256: c006bc7f678c706252014220940b4ee2e39efd8f276fadaa9d9933693444428f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=dream+league+soccer+2019+apk+download PDF link annotation
    • http://vasvaripalmuzeum.hu/upload/file/zabobitewevugonaved.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/xigavatodidubewiwisu.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/50744784806.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/tuwagudodejawalasezufuba.pdfIn PDF document text
    • https://lorus.rs/files/vidanuxiweduzenuwutiwo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b176fa42bc---72057784907.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/57634378055.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/55905851874.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/33756905807.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf006f0d---disuliwefelup.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/rudenuzo.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/25345045077.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/16881076377.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/gumazilog.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/78794819630.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/16025478082.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/30364929835.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/95351826620.pdfIn PDF document text
    • https://ksuskalology.com/images/file/pepadovutegoxugenomarowo.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/28086388690.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/62978195291.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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 15872 bytes
SHA-256: be4643488768a4a8abd9794b2ce7dac6783c55bca732609472c76e5f54f99fae
font_02_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 11408 bytes
SHA-256: a12c181de38b66228b5ee0734f098d05208cc95cd666bbd5066d323717fc8b83