Malicious PDF — malware analysis report

Static analysis result for SHA-256 6523ec9308938344…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 12:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d104792943440654dad8ebcc19d052a2 SHA-1: 9f4f1b771bfb4361d908b2f598db28bc3b5409e5 SHA-256: 6523ec9308938344a3965daf24e32e449194e35a75eefa177dfee22f4db842cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://clubesquilacoma.com/uploads/files/81542245782.pdf In PDF document text
    • http://seyrimerdin.com/userfiles/file/jilixa.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/95603441438.pdfIn PDF document text
    • http://asid.rw/userfiles/file/66442449670.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/sapufoleburotesenog.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/55841530509.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8c1887da---19132336757.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/33328616045.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/22658498614.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/femorazulujuju.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/28042240913.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/82421445230.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/22908360465.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909075321.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/32171784313.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/raxerujivonuzafirujupuzuv.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/1765735389.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/49560560999.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/81143954709.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/73659266070.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/nirex.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/nuxisanavuk.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/kitolututemunukab.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/zanalek.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/83523088110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=camera+shortcut+androidPDF 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_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 16988 bytes
SHA-256: cbe1991b6cbed7c553b19028d27369e680cd6b6a4d02baf26eff3932b7b53460
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10720 bytes
SHA-256: 3f7d013a99c35019ebe2f8816c520010712d411a255d8564129ce5d8d609edbe
font_02_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1