Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eb2680aeb5fe42…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 12:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ca6b3ecb13b5b18f81f823ea975880e SHA-1: 0dd2d219af7c8b7aabc89c0a948f97e89da55be9 SHA-256: a5eb2680aeb5fe42cfedfd3f6c92742bef4f333e6ae97383c414bc8c14e3766b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used as a delivery mechanism for further malicious activity, likely phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=android+send+sms PDF link annotation
    • http://encino.kopanramen.com/uploads/files/zisazoseduvabuw.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/71052563013.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396930bf999---82068484747.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/82517681826.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/71629127416.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/34262746498.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/21357249208.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/11806362738.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/xakixipimi.pdfIn PDF document text
    • https://kvzriu.org/images/file/jitofageverusexo.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/furipefakijewidugeju.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/65867854868.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/97200978499.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/90834921548.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/98662999838.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/sizulofe.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60e715818---kosibivoligi.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/39899922807.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/xikofefilutitaxibale.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/kavekopawazifilazafora.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090917190573499.pdfIn PDF document text
    • http://benetalent.com/upload/files/zegutufapelub.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/3868887987.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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16636 bytes
SHA-256: dc375491ae4ffec89fd0b86f80c894b1667b50196d447a72d0fc46fd9b61f438
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 10084 bytes
SHA-256: d611d2380d3f9488c6ac9ee272f3ee387503943d088b20bcf4cba62541acae4b
font_02_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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