Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40ac6ddb7f31093…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 20:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be6cc186dfea8ced477e991a975dcf75 SHA-1: 31fbebf894aaf7df903e02484002e250387d914c SHA-256: e40ac6ddb7f310939c1502ee70fefbce74046f9d0a81be9a1c24c03154348dd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish credentials. No scripts were extracted, but the structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/midagapademu.pdf In PDF document text
    • http://quaisetoiles.fr/img_pages/file/12197070747.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/nowadanozebobip.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/mumoneturukokezexen.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xugasekupogu.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/58518416592.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/81443817072.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/93878536853.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/3622758857.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/pedaxobemit.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614397a80a672---tajabutamut.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/fojixab.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109135732_829996699.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/73944700559.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc03ae1709---60467274346.pdfIn PDF document text
    • http://come2menorca.com/images/file/wezap.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/xadusebituw.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/nopumegukalemoz.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210915143306_mkwdgj.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/raguviwetezifimerax.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/39267860674.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/kajezuvug.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pepupeze.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/76664255484.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/kidevuguraxirot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+hd+movies+onlinePDF 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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 10296 bytes
SHA-256: f47d6ab51d4c7e9b30033ea413dd23a442baa89cc058c28be3976c3cfa7189c9
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 17112 bytes
SHA-256: 9606eb16760549a135e8ed350fd07bd773afd8cf8abe97658d5778d3c25c2fe6
font_02_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1