Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e21a38c99a22e6a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 07:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1dd898e31dd0c0d004a44612987ee33a SHA-1: 9777adf478a581ebf96db9da1a5827befef4c4e3 SHA-256: 9e21a38c99a22e6a05166cabe60f30d72fb1c72de9eb67988cd3874599d4cdd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pistant.ru/uplcv?utm_term=the+ladies+of+the+house+full+movie PDF link annotation
    • http://metisentry.net/ckfinder/userfiles/files/vegavojo.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/sipurogomexerovatugome.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091903550370554.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428eab66db---15020238161.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/23388540515.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/rubupapirunaxakozom.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/vidugupiwogujusituj.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/nelaluzidape.pdfIn PDF document text
    • http://e-sheremet.com/img/24172243751.pdfIn PDF document text
    • http://rc-modeller.se/images/file///61462690272.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec82f636ff5cd310d73fc6ffc2c2eb27/kenodava.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/suxepuvare.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/56083310427.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/70987145271.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/toxelavezivozanilavur.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/78863764618.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/direvodadokajutejafarabi.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/71800564299.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/66792327706.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/texeliduwovukekadukudalir.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zuxerorujivedevekak.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/26599540308.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nugikejaziwebox.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/jizigodawuvifisi.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/zaxiwudotan.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/90569021661.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/rutedonixixowasogebaxanon.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_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10544 bytes
SHA-256: 1fe749d208e34763ae2c493f6c7e2ec9a8a9e2b34b86262df07a46a4ec656dab
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 17760 bytes
SHA-256: 76e507736bceb41372b99a2baaf0dc309a726166f887c987172036494d11d699
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1