Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d90762ba015e8c8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 00:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f3112ba1d80db9d4e9f2f4738bfb59eb SHA-1: 0581cc14813f11b5b8c764ab3a52fe94613f99ed SHA-256: 3d90762ba015e8c899f022c8c0173e19d5843ff2aa4a533faa8252a603f30cfc
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 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dichvugiayphep.net/hinhanh_fckeditor/file/40686529509.pdf In PDF document text
    • https://lalicorne-hotel.com/userfiles/file/97365720977.pdfIn PDF document text
    • http://standardamulet.com/files/files/40700537242.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2adb12eb---xorunafigavukorukaturiloz.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/vekobe.pdfIn PDF document text
    • http://isvpro.com/custom/files/9780019707.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/14822113855.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/8785689256.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/gibeseviwizejeki.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/pivuz.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/gupogal.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3plq8i3qtj7m95kmvfkmsihk36/30290577287.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/rimozofe.pdfIn PDF document text
    • http://vit-physio.de/file/68725624605.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/33575300536.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/sikajewofizitot.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/wulesave.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/13719853097.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/gemidalulabenidorusa.pdfIn PDF document text
    • https://renetravel.ro/images/files/22209180503.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/64538141135.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/timewixazi.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/72495585061326113619d0.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904075833.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/66947203495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=good+words+beginning+with+oPDF 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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 16836 bytes
SHA-256: bc515267bb1e625476c3b32c6497498839c15992dea546632f42d2a2317203a2
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 10584 bytes
SHA-256: c69529008b9cdc4bae6545396146a5daf63df218e5eecce3d0338d27b2fc7aef
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1