Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03c3cd75b0ee713…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 13:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5457c81de60d965bec8f2043c77593c5 SHA-1: bbb1d56967b9257987cff8117d77c6a7738d1d4e SHA-256: c03c3cd75b0ee713e4e52ccdafdff39ba96784659e4aaa2fc71847d2ad5b463b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest malicious intent, likely involving the redirection of users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kantoromega.pl/userfiles/file/28580424556.pdf In PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/47188851507.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f426abc1e---piledekatobetotodap.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/50973143520.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tovono.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/xanuwupidalunejamazoluvuz.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219151547429827.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/10940981392.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/46418623197.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92492917508.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/36184677202.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ketakulivafefexosukimutip.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/93826830933.pdfIn PDF document text
    • http://all-premium.com/user_file/files/54870226968.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/95572311307.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/73293466147.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc240a80e8---gusemobuwavezosiva.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/73523141148.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/93113899973.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/81458568449.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/70858241609.pdfIn PDF document text
    • https://bselink.com/userfiles/file/13420934046.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/turiso.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/kagefufirewikefuk.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/47141830541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+missing+internal+storage+fixPDF 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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 17696 bytes
SHA-256: 3ac3b3a33dd21e3891db26899cde9c66064c444d0c5c235aa0571059399d51df
font_01_sfnt_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 10780 bytes
SHA-256: 40a1e9d0f2eff4ed608f5b2541eb0f58c91a9e198a13633c65308ce20cf4a6f5
font_02_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1