Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33aeb46b366b8d8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 05:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5991a1a29e5bc6e33a615f1572473621 SHA-1: c9f1721917420aa628c29210e931eb4b289f3db7 SHA-256: d33aeb46b366b8d80330b09a52afb2a89845e26a0569a661a3593f3ed7ed6b56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, including one pointing to 'catamma.ru' with a 'roblox apk android' term, suggesting a lure for potentially malicious downloads. The PDF also functions as a link farm hosted on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=roblox+apk+android PDF link annotation
    • http://angelofthewinds.net/ckfinder/userfiles/files/10746514683.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/84018859352.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/38897332510.pdfIn PDF document text
    • https://timminsrenovations.ca/file/mutbWPJRMEmqwhMh.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090109592473499.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/82263698620.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef95abae06---fexepagunilikivugemasa.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/85007014950.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/49655355929.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/kipiwukutafusebebe.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/24570648539.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/59787076050.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/dudipivukobanugezudol.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a97a0f85---77579671536.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sudesirorukoge.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/99043521460.pdfIn PDF document text
    • http://mallncart.com/userfiles/files/60168238902.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a721d2df78---58324004852.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/25859061014.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/91524367015.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/83615187581.pdfIn PDF document text
    • http://ruihuitax.com/files/file/10973970990.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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 19036 bytes
SHA-256: 8a737acb35f3f3305e38c4c87d6898f66fad6589443da023fbbbe9239a6992c3
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 10368 bytes
SHA-256: 832ad2d77fe311b08a10943ac1da2a2bf9e6c1ecb2669b1533a3ac368990f79a

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