Malicious PDF — malware analysis report

Static analysis result for SHA-256 213a0aa86cf62602…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 12:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a02203fefefb448afbb9cd623ec7025 SHA-1: 42852c0ccebb1e51931d459cab6017093cb683f8 SHA-256: 213a0aa86cf626024a67009647ed27219cb8a8ce196ec1f8758476eb992674a4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, suggesting a link farm designed to obscure the true malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to provide a password for a downloaded archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/arjn38cbusrjo1t0elf4lda7l1/86575462625.pdf In PDF document text
    • http://hoangduy.vn/vn/files/86864724160.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/55811920873.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/80370520955.pdfIn PDF document text
    • https://masihpt2.com/contents/files/84966349696.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/kejunaxibotal.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/sufaxuwedibolarex.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/22047778511.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/bebutabafefanumixesuva.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/26916907068.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wivasisuse.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/tibib.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/bematuw.pdfIn PDF document text
    • https://funbugs.ie/files/file/89998025997.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210924_6CDCDED1CFACA43F.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/folef.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/vuxuzumupob.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141659e2d977---fuzabigekixekulole.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/muzolila.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/57027668928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cheat+counter+strike+extreme+v7PDF 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_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 10888 bytes
SHA-256: eed61075cccd41c77280332094add64c9ac9020fdac01e837f16013015bca935
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 18172 bytes
SHA-256: c071abe40f7ec0e9f88a891bd1977209b724fd4e80ea69df94587cf0131429e4

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