Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a0b3eb9ecc0857…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 15:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19fc11f0a427d0c14fcda00b30ca3d2c SHA-1: 63e31da9d9dd6a21f9f0f119a7dd6d20e783bbac SHA-256: 95a0b3eb9ecc085752a7742797aadefd7594761536bb7dc52282a46865bcc4b0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious content or download further payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://floramarble.com/uploads/10479638328.pdf In PDF document text
    • http://ninda.vn/userfiles/files/lolojo.pdfIn PDF document text
    • http://carbonelite.ru/file/71389223109.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210904_12E4F6D4BBE356DE.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/padide.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/95625214003.pdfIn PDF document text
    • http://mfahk.com/upload/files/83236065955.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/taremosatuzerobar.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/lopab.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/98285540051.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/mebowitavebe.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/82054459711.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161392b5c38a69---sogozefel.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/fasoxalazudikeru.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/kabanupix.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/20199967234.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/gizamivozutojelolupeminex.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/teginujuxunijox.pdfIn PDF document text
    • http://vln.nl/files/file/73620408216.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/8813347550.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/jokelogame.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/jakifivuzerixi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pirozizalok.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/76940526641.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/32921966208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+nzb+download+clientPDF 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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 10464 bytes
SHA-256: b61ec7039bb441e5dec2ad099317870be093b8c077b5d69b7b644b57503e0043
font_02_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 18800 bytes
SHA-256: 6d9d0cb5cc687bd83d387ddb2e83415e24ab537b4ef959620fecfcebba5e2805