Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04e2f82f4a7b62d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 23:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03d6e5bbc71c3d63359b7e6757022023 SHA-1: 2f11480205bb670c3e58e4e7238f64084ca113b4 SHA-256: d04e2f82f4a7b62d28452dd0d58cd4710c1eb84fd878086954a0d256192cb0b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document functions as a link farm, directing users to numerous distinct hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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://jordanadams.com/ckfinder/userfiles/files/moritatepedolobe.pdf
    • http://moveworldtogether.com/datas/files/31027431656.pdf
    • http://bnblspecialities.com/userfiles/files/vumukiwigagerodiv.pdf
    • https://unitjaya.com/contents/files/fodujetelezuxusijozujisoj.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/mopikinixa.pdf
    • https://daynexweb.com/upload/ckfinder/files/lawanaxubepobixigapariv.pdf
    • http://farmaciafici.com/userfiles/files/jelezumisibobivogo.pdf
    • http://tunesistudio.eu/userfiles/files/wegozasederogin.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161468a130ad31---jijikodibozi.pdf
    • http://stavebnevyrobky.sk/www/upload/files/16994595884.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161424fca14645---dupoji.pdf
    • http://naoshima-habitant.com/images/blog/file/dufijumobunazuwuvunozapot.pdf
    • https://ambalatender.com/upload/files/zonulaxejewowufedowavo.pdf
    • http://cityclick.it/userfiles/files/30776710892.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/18649682467.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/72647479980.pdf
    • http://parmalab.it/userfiles/files/2571696315.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/55578681789.pdf
    • https://samsunyapi.com/userfiles/files/pixobomedijugivog.pdf
    • https://barcelonacentromedico.es/files/galeria/files/8314190538.pdf
    • http://tuttotop.com/userfiles/files/voxurimonaguwaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+industry+is+mcdonalds
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b101.bin
4fe30547949f88145b9ce057fd3398881ed0ce1155b94e07c2421afedbdb3f52
pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 16560 bytes
font_01_sfnt_off0000db7c.bin
a1119ff51dd367626a2f32b24fce6e833df5995095adb630ee885437ae71fba2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 10708 bytes
font_02_sfnt_off0000f3ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16792 bytes