Malicious PDF — malware analysis report

Static analysis result for SHA-256 597f8c9e69697c4f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 09:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ab68e67aae3aaee227649e0d72c6a51 SHA-1: 228ce092ab4c24621fc3495a8d38a52aff938986 SHA-256: 597f8c9e69697c4f9b8f379634fd004e00819e55125956e1cded9c02b0af57a0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external links suggest an intent to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • 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://smidgel.ru/uplcv?utm_term=watch+vijay+tv+shows+online+live PDF link annotation
    • http://vitacanes.com/uploads/files/56998469378.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_113803.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/435141435.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/xalovolesasalugi.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/bezunavederonibabawegikop.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/93536827123.pdfIn PDF document text
    • http://tayles.com/uploaded/67865742997.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/96148339630.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/67175198346.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/17754633569.pdfIn PDF document text
    • http://iscelenie.info/files/file/newezivozejogebozedeju.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133061f60606---jowivibefinotemuvugi.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/pegujumejan.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/visoguzinul.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8bbfa2e268f0bdb8545d402234c4e90d/jaxixorezatefefi.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/wazomowogemunawoxaxido.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/golaji.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/kuwezotar.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/17711013757.pdfIn PDF document text
    • https://flomogroup.com/upload/files/jajezofefo.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/1949290046.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/47178472606.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/tokunisedimisevipiloxos.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/lebadijuwemeg.pdfIn PDF document text
    • http://cochemical.com/upload/files/52701168660.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/kerewogagobotulaxegub.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_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 10616 bytes
SHA-256: 3eab59e40597a08ada4f247a663c8023ed0fe3a28ca30b059dbf10cc49e62d62
font_02_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 16568 bytes
SHA-256: 2a005e009f28bdf00d0fb3474d0918c41a6c57d7926c461fcc1a2ce7616adf25