Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b810658c9a2573a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 16:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d363ed68c7c6b1b3df4ee198909419f SHA-1: c23d95404226c861f1033d636b028059d81725c2 SHA-256: 3b810658c9a2573acd4474345062404c9894b73fa45157683b57b7f5e536f5ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious 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://le-lemniscus-incandescent.fr/ckeditor/upload/files/zimunewupirisajurorug.pdf In PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/25594273592.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/20129369022.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/86312341021.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/46661144114.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/29792912401.pdfIn PDF document text
    • http://iviltra.lt/images/files/lovogefenetakabebin.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/16842399478.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c108bd154beff076d4629126058a40b4/73999943905.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kowozuwosonunadexiwido.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/3607401197.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/rokedurexelujoxeragareni.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/73067419617.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b339a8415---30053144899.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/166559776134c6d93f329.pdfIn PDF document text
    • https://laser123.com/geektic/files/65310558121.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109040257444687.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/99600349678.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///teduzuwavadasazadefalegaw.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/94290025667.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/fugiwofetirefaleririvusu.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/pakirezikived.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/voxitogoj.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/noxitasasixewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=warhammer+40k+codex+online+freePDF 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_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 10860 bytes
SHA-256: 19b3469b90069572749be6e4b1239f470afb6e2340f8a06a47f0c25fedbd889f
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 17256 bytes
SHA-256: afebd2a33f70bd3ecdbf5c5896779724ee2639e31e273569d8b5441719187444