Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b96c3b6067357bc…

MALICIOUS

PDF

79.3 KB Created: 2021-10-11 16:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e576264ee391d44059cce272d232c032 SHA-1: 1e7e5deebb64874f1735e88b2883ec8b66696013 SHA-256: 6b96c3b6067357bc41ef7fd0f0796450acc21136d552fafc5f2ed2c44fbaaba0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on domains that appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a common attack pattern of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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 http://hospitalityroyal.com/upload_files/file/70520240905.pdf In PDF document text
    • https://dunaweb.co/bg_image/files/45433802427.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/33578418935.pdfIn PDF document text
    • http://lovesenergy.com/file/62645000733.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/12251426470.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/goberafavigipedogib.pdfIn PDF document text
    • https://mlspoland.co/files/file/16055574707.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/51816234692.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/pelokeziwog.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/15192109563.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pamibadiwexut.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/66133169750.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/wekapujowatat.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/vezur.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/95125878193.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/godimulemilurujidapifaso.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/batagurugotezebuvasegubib.pdfIn PDF document text
    • http://deauville.ru/files/file/44417803379.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/natomukuronubewuk.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e17cf605af---kobopesolifesatamijizono.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210919220302_1946328212.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/96541332202.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/nuwukivimiwefigoxo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=plant+vs+zombies+cheat+downloadPDF 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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 18584 bytes
SHA-256: e377e121ea5033a5b335d1247ad83bef7ed1e7ba3b2ca2967cb4cb20c1003080
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 10888 bytes
SHA-256: 4e2d5856334f7840bdb401a2670e56af95a12b3a6081547ab54cd1e7e3dbe700