Malicious PDF — malware analysis report

Static analysis result for SHA-256 96620e78eb49843c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 20:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4833e9dd42841933e7b8d8bb50084878 SHA-1: 535629929d36f324d830e7ff6cd2669a5e57611c SHA-256: 96620e78eb49843c52aa7cdc522909d3e8a1cfc4f019e23983f8e5dea87fa0fe
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'synerhu.ru' with a 'cheat mlbb diamond' term, suggesting a lure for game-related scams or phishing. The PDF structure and embedded links indicate it functions as a link farm, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=cheat+mlbb+diamond PDF link annotation
    • https://adepotcustom.com/UploadFiles/file/20210909232417103.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/sotavosigejafoka.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/fedolipojikanirofeboto.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/79896194027.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bevukusabuvefajejon.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/nokokobevawawupazo.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/88145017665.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/11631912581.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/lakasozesezonebinizadi.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/lasejobinitano.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/85341814850.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/48874603942.pdfIn PDF document text
    • http://kaies.cn/upfiles/210908182825272930p1kwgm.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/48055612605.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f414c0f---vuzovanekobifa.pdfIn PDF document text
    • http://chemicalengineers.ie/images/65929475576.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/lugikujalunab.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/2998039653.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/68996738005.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/10219534613.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/33505066329.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397b2fb0b25---54983361739.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/74661138872.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/77716385053.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_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16412 bytes
SHA-256: 3795bb456e1015f59f2052efcb82751765bdd7e59c6aece2fbb6e1e87a5386d8
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 10416 bytes
SHA-256: 4ee66def4c389e97d102f2fd23343d24dcea90d0e77723b54d40f0ec876494b0

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