Malicious PDF — malware analysis report

Static analysis result for SHA-256 da05ab427fe7bbbd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 16:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: d4311541f22e159b590ade58b354965f SHA-1: b08085cac5fb7dd1fb4a7031e38b6dce84296590 SHA-256: da05ab427fe7bbbd053426ba8fae5df33e60ec01f802e1c1f7c9bdb8e157be1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tko.wavedev.net/img/files/files/8729464645.pdf In PDF document text
    • https://khambenhxahoi115.com/images/files/bovupawawipiki.pdfIn PDF document text
    • https://novitas.ro/files/76630989399.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9cf96acf---76026633738.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/fibidanokabotesan.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/marepudujefavi.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109031817107210.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/78011114133.pdfIn PDF document text
    • http://hybsch.it/upload/file/wumesokivoriziduti.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/gokamituxunuvudovusis.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/sitafaxeboxed.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/13328794125.pdfIn PDF document text
    • http://saimiri.name/upload/file/lorosufonavozuzefigewoli.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/55111142886.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/vodafijajomefanusasurap.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c22b340b1---23833166130.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/97915228970.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/wukipawel.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/3405680049.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/xudowadexodumad.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/lapuvumiriwatomobusi.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/47944540990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=top+15+largest+countries+in+the+worldPDF 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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 17620 bytes
SHA-256: ba9e72804751ab7362fe283a8420bbd57e01a6ff3de499d7952df43031d433f6
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 11128 bytes
SHA-256: 8701dbfe27bf61bc77c6ad156a122180c9fb08c73128139c7e1ec5558a657db5

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