Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7da487968f0df9…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 05:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b3f57d8d2bf8d87c370bc192750a64f SHA-1: 130feacffb07cbda207fb5da8a02ae74cbd4ca46 SHA-256: fc7da487968f0df91d0dd5770d1a62f17fa93d2ba0444c4a9f3757fd707a05ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, a common tactic for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://synersys.fr/contenu/file/32743266207.pdf In PDF document text
    • http://zaintik.org/files/galeria/files/88750166913.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/24186961401.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/divizesefizasofisu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/botufakiwanalo.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/42644263520.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/repatalexoxujilotema.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/72565441298.pdfIn PDF document text
    • http://zeci.nl/im/image/mujefudabisux.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/veludefubo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///61649837168.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/gidaberidopofirorodakox.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/sidizozapoxopojupida.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38864437127.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/69528916272.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/62425952719.pdfIn PDF document text
    • https://legacytwirlers.cornerfamily.com/userfiles/files/refipepotip.pdfIn PDF document text
    • http://lamay.de/userfiles/file/74193244023.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/48705497654.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/i9vee3oug6hd3dv5thvt760jpc/65725040495.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/tawurizabuwizirob.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcb5fee9a3---63512958636.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/suvedot.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/bikiwikidujujorejalumeb.pdfIn PDF document text
    • https://uangraja.com/contents/files/totazewaruzidexelujugite.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/72738167079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kissing+booth+full+movie+for+freePDF 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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 10796 bytes
SHA-256: b43da4e4b8f8c2acf97b5be99a1a85794a775dc629d30f4dcbb061ab9de2c2a0
font_01_sfnt_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 15348 bytes
SHA-256: 18fb9ea59b0fd36156396858440598c0fe976e428e4d5bc43429dafafa40ce71