Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2c053280e902a9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 22:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7ffabdcf877a848fa532d2fc1274694 SHA-1: 65f5a763c08b8386f8bd9f94047d7b24486f77c2 SHA-256: 7f2c053280e902a9d2ab6e43b5894672a07fdd601d37c841b0cb482142166c08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=grant+uri+permission PDF link annotation
    • http://kimsanghun.com/upload/userfiles/file/20219121351113132.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/miwukiwirefubonevi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/52893180300.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/xijagakusow.pdfIn PDF document text
    • https://ntc-container.com/upload/files/86290086738.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/99391965914.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/vemejufu.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/68206119023.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/11946772125.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/4862543758.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913214331.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/metijavutakesokinizenufa.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/pidofinorodomokure.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631226244.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/fuwoxejifuko.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/15679415384.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210913file///xesukilosuxovaga.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pimatebupifetaw.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/ropadenexalimaresiwik.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nonesof.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/92739141637.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1cv76nmqg325fbb9h5h3upfdh4/31483904677.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/33699626346.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/82622217789.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/37999299065.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/koxagi.pdfIn PDF document text
    • https://ijp2.com/contents/files/46085547282.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_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 10508 bytes
SHA-256: 6834478491139612d5f973cab5fa8e3a58691ed3dcdd7e390341abb0bcc8ae08
font_01_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 21420 bytes
SHA-256: ba94979dc7545291b502ac988f403920be7ebeb5f6536c2117447a9979eac792
font_02_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1