Malicious PDF — malware analysis report

Static analysis result for SHA-256 75646d7390444487…

MALICIOUS

PDF

74.0 KB Created: 2021-10-06 09:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b364113b4f00b59967134f5c3048900 SHA-1: 8ae9d926389a37bd86d81cc87ec9c0cbcf2e61a8 SHA-256: 75646d73904444872901bee389b05e01d6f1a74e2e62e0e175e212fff254451c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, potentially for phishing or malware delivery. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high probability of malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://uclerbaklava.com/resources/file/20317705118.pdf In PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kuperadopasawudil.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/tobadam.pdfIn PDF document text
    • http://gr-chem.com/upload/files/zuwobukumoxoripafuzulutow.pdfIn PDF document text
    • https://partetesal.ir/data/file/64761987166.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/36403390214.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/zerenelu.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/67340393926.pdfIn PDF document text
    • https://pu.vienhung.com/webroot/img/files/kodubupanuwumapixasukevor.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ed523316899604cb9fdf77ff42c62ab/71416803503.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xevaxakewediv.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubovu.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/66006324235.pdfIn PDF document text
    • https://aneri12.cz/res/file/28272696713.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/113406550.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/58080990753.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/ziwoxijapifipunezodaw.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/jozovejidakanejipo.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xewigo.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/duxisizonupufodoteneme.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/koluruwuruvinuzulo.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/40713574528.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/nomojulasabemonod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bank+bail+outsPDF 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_off0000bd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 17584 bytes
SHA-256: d95e5a740d3dce2fd2a06c703d499b654371148ce459e67f2170c34e5589cb30
font_02_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10252 bytes
SHA-256: f79cce93912145c4a63af689389ebf7928fce0833faf90cb687b91a9e1881034