Malicious PDF — malware analysis report

Static analysis result for SHA-256 238220e2442b0c2b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 20:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f26106fe9444da0d21fce684fdfc79a SHA-1: e2c216d82e974f742dcb3c7dabf44d2711d63cd4 SHA-256: 238220e2442b0c2b92cd2122a4d0d06b4910a3476775029fdd7e21dddadf08db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of external links, many on disposable hosting, suggesting a link farm used for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/17450797224.pdf In PDF document text
    • http://herve-coiffure.ci/files/potetetezatumimojede.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/42666471152.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631113168.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jowebunufunepavanolu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/47304050247.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/68553797366.pdfIn PDF document text
    • https://ibextrail.com/editor-images/makewebasaduzoxelinemu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/31911415013.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/dufasetakebamixipojino.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/vimowesad.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd2dec170---25658543088.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/rafuwixutipizetowi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/zojifevono.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135e340c55e0---zajizukamizanabalunu.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/37198688833.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/zonagazubuzatev.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/45632361896.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/xekakimepujaredoz.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/1677568042.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/tezobolopobexikilusozomiv.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/22052547228.pdfIn PDF document text
    • http://vucert.vn/uploads/files/midozedazenelibalimasufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=software+development+core+techniques+and+principles+pdfPDF 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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 11360 bytes
SHA-256: 975439f3df379d2ad02d37dcc963b82623f662f2d13bc988ac1620e347c39c7e
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 16984 bytes
SHA-256: a949c067be1a17b8541b383bea3a7d989c787fa038f871f1ccbdcfbb84e4883a