Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7778f7ca8a4aaeb…

MALICIOUS

PDF

94.6 KB Created: 2021-09-17 12:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36cc8161d7bfd1d32494e952e8274629 SHA-1: 7c4e85631d40195f07cb2d88c59bc1ce76397e58 SHA-256: b7778f7ca8a4aaeb74db7fa23f7cf5478a2980ca6479d486b0fb061b2c442196
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://coretry.ru/uplcv?utm_term=fast+and+furious+9+free+to+watch PDF link annotation
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/4131771453.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/jikilegiliri.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/eld6n1ts6cfs7igead4b4q4c71/48344326726.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/vejinapikatamiximus.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/23955573699.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/nowifaforawolan.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/gesitobobisuvudanit.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c588083da---49940183484.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/34510809038.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/degenejeweroku.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/49357486082.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/45827327325.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/31413953154.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/40205567374.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/2289409266.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/wopegujafunebixibusame.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/mazunolafolivifopalax.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/nuvakisirupekebenowij.pdfIn PDF document text
    • https://ultralloy.net/upload/files/82881589652.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/63034016835.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/wosenekeduxopefejilusofu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/68239581935.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7182516536.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/9854572417.pdfIn PDF document text
    • http://dr-temt.ru/images/file/jatizexubujufen.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/40949389621.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_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 10860 bytes
SHA-256: 4b3b8b4abc8bc444f9b32f4a62660598b21bb66f8dbe93f7eab893af25756946
font_01_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 19928 bytes
SHA-256: 9167f253a46daa9b8512ed32dc9fac05e021d96e0077a1bbedfb1fd200dae995
font_02_sfnt_off00015469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1