Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c2e63ca38fa5d6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 17:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74959d4b070d99713401d7119f0f02df SHA-1: 280600b567aa90a07b141c62cd1fd87a630ca56d SHA-256: a6c2e63ca38fa5d65259361bbabdbac0f331ec338ac914a30b8c9ec7232ea9ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which are designed to redirect users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. Although no scripts were explicitly extracted, the structure and heuristics point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aawyx.com/sites/default/imageuser/file/bigazajomu.pdf In PDF document text
    • https://landtop.com/filespath/files/20210912114740.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/wopizudepudepajededi.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/jokajudutararofovizob.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa366023a---pusupiwomowafitupumorup.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/loxupabad.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109120325481827.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b065836764ffccf632069aa74df407b8/84357478321.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911135944697453.pdfIn PDF document text
    • https://mcsfood.com/images/file/35568819725.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/90196410344.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/76544180948.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/63162374278.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/bitonunuriwikabizevero.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/29143384228.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/75456677678.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bekafofidujutakedo.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/ralex.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/42702597853.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/40625047453.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/68828296617.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/978c0228ece674dc6823318ccf5f2dbb/nerizuvazixalogijuregi.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/ladosepatodesitofigeb.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/pinamatefikuvulunibedima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=live+match+streaming+websitePDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 10760 bytes
SHA-256: 685cc2a81563430256da0726bf009281b811a4b4afd03dd71c05822d67d25ac8
font_02_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 14572 bytes
SHA-256: e1684fd69636f55ae9e56443811f91c8d0c2ca4fe0af08068931656bc0c00666