Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc3be650a2e777a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 05:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9578b2df175e768bf1e40dfa9abd008 SHA-1: 09ae285fc8f4c24aef60922910f89fc6c3fe122d SHA-256: 8fc3be650a2e777a81fc5fe3b375c34b3ba57638f1686813e676eb8acf9fe5cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=how+to+switch+ios+to+android PDF link annotation
    • https://myparrotfood.com/user_files/files/21410420250.pdfIn PDF document text
    • https://vientangluc.com/upload/files/90420877606.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/tinudowogizomubor.pdfIn PDF document text
    • https://premium-house.uz/images/file/xipufupisepezurotali.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/47624493855.pdfIn PDF document text
    • https://profesa.net/userFilesfile/palemuwadiwuxofu.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/linuvatatifavasekibuj.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/84559910328.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/33157066891.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ziloxelobisigilagusu.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/56092953894.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/31951782040.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e6a17a8e---wudofejefokoki.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/zonaxotolutowexelijo.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32604452956.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/66365338268.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/takaregususogevixid.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/19971641969.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/fopiwuvi.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/fifomasu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/duru9fmuf0820srlvqlv8d6jb3/24477952857.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/rovuwex.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/99244948637.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/lidogagoveko.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/taravodazogomipinojap.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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 17624 bytes
SHA-256: 6882af9485e9757dc87479a929209843bde3a5291393beba8de1c07ff6e3cd31
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 10368 bytes
SHA-256: c5a43e4070e654919d581bbed9545e904ec318a08223a7ebc923f5833f4d017c