Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6d62eb7f89a084…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 08:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85e1973e943aa7aabcc450a42ba8e377 SHA-1: 07b501bc86d378d14486259aac9c01dea3012005 SHA-256: eb6d62eb7f89a084ab95bad764cd56062e104bd019ae1f75a0ee229d2753ff08
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=iron+blade+legends PDF link annotation
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/vibesulunib.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lamutinifikede.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/acd0mh0pn108i92ggm3giclmou/11546150263.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/82115204796.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/37373151916.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/81872272599.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/80950768762.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/48890770235.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/36508157020.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/fizujuramibazeladuzo.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/gipakipiwobivunodawexi.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/ludazuge.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/68456794190.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631444351.pdfIn PDF document text
    • http://orthodoxnews.us/file/tumuvuxuveripamavupaga.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/95506258775.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/wikigubodelagupo.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/21007761550.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/28583246087.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/68819409913.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/rawodekaxulagutanunamam.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-09-21-05-79.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/luxuten.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec95c4e0f---womexi.pdfIn PDF document text
    • http://linker-apps.com/files/50396588283.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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 10324 bytes
SHA-256: d675a608ee930e9f3f1544525b8b8a978afaf13e52cc631e9945029c22b29618
font_02_sfnt_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 17560 bytes
SHA-256: 950282ae0c58bfa4690d4909f427b49a60bc559f5676bfe20916bb2905a59915