Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fefff58cbaca5e1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d989e6379243272c6849ffacb1e16b9 SHA-1: eff442910ae27709036616736a3f2616823e8b4d SHA-256: 2fefff58cbaca5e1bf428634af03f76d166d62a11c10aedf4f5ff2cf5cf07c3b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ke-sen.com/userfiles/file/1631318444.pdf In PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/vefozosegepamibebu.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/24347453981.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/59675995624.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gegosor.pdfIn PDF document text
    • http://analhospital.net/file/files/69116020198.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c88f8f040---vulegakapozirenivas.pdfIn PDF document text
    • https://camphacement.vn/upload/files/61268140391.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/75734095367.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/52993339325.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dp3i1md89kp7mugvhbdkcib1q4/guradivivevibuxusiwex.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/11710351757.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vuradegapekare.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/33258643000.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/danerugokurida.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/tagekanipazotasowejal.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/talox.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/8422761434.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/59501580674.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/radik.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/sabimodoz.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/2519859709.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913082440.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/33826023805.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/memakujasulusotebamepinem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+hidden+folder+in+androidPDF 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_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 10620 bytes
SHA-256: 3b96060ba7cecf33832231c7afb65a014b46f812b2501c990df642c1778d2480
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 18316 bytes
SHA-256: c0e4873918786bc5969458093d9727c9bdf6f700ccafe0313203cf88b7b1d80c