Malicious PDF — malware analysis report

Static analysis result for SHA-256 09515db95d30435e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 11:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46219a235fad49e2b7e300c48cbc29b6 SHA-1: e96566055833c09b50e034234a415b6660cf5936 SHA-256: 09515db95d30435e084e555d591544539ac7092138ad1b1e0a73a1154f0ba361
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pixomot.ru/uplcv?utm_term=boardwalk+empire+stream+free PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3203d3a163cf019f778568eb52b73ab6/45674343230.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/mimojeli.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/78431326916.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/48617994002.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/27219116123.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/puterojar.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/86392728105.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/potovevirurovokapuz.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/kurewavowaferigusozinu.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/binavasuvazazezodawutidop.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/77356543368.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nijifajupapile.pdfIn PDF document text
    • http://it-hair.com/userfiles/bajuvofokogumuxir.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/siberugogibu.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/gufozugaxuwerolebezox.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/fikadug.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/zuzakodotuwolufatibab.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/durubiwujisovalaragototam.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d97c3694---namutonev.pdfIn PDF document text
    • http://hoavily.com/uploads/files/dijujutobi.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/putawima.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/17507670841.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/geburojo.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/88378596005.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_off0000b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 10784 bytes
SHA-256: 558ad4c566f042e55a8d97c3e9abb56c97d3f75635fff7c334c252324b668734
font_01_sfnt_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 15828 bytes
SHA-256: 29f07f01e01bbbce79ed9049706a5a559809aa6b9a96070fe288ae5125c054ef
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1