Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9977ddfad408e9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 15:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf95765a8161e580a00b98efebdf1f64 SHA-1: bf5c41876f76304441a0fe3fb7d34200965a5a04 SHA-256: 1f9977ddfad408e9a628702129df23fa01669b4eaa2616ad87727c60ad5e4057
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that this is likely a link farm designed to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of many external links suggests a potential for downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/41720566740.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bcf4b07e---30500156586.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/18992844165.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c01a8947---6163496763.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904200430599142.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/62319829510.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/sawowas.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/58400226447.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/63561690417.pdfIn PDF document text
    • http://beijingteye.com/upload/files/97442509289.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/92115698338.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/50318239715.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/gijenixexufirit.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/58320197772.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/77044749888.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/34339543497.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/44522149482.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/jelosomubenokuxuvisap.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/4858026001.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/76739032058.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/36937524626.pdfIn PDF document text
    • http://electric-kernbichler.at/47594224000.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/73939476574.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/mukugididovetokozoku.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/77240461428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wifi+hack+pro+apkPDF 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_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 17060 bytes
SHA-256: b0d739e683338a20c75d04a72652ca5cdc16ee811445eaf0975a68771870a641
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10116 bytes
SHA-256: 41d7c34fb2ec726d77a2954bb65008e0bc0b7447e5a15734f7eeb79af3dc4e88
font_02_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1