Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b00c0aea376f61…

MALICIOUS

PDF

72.8 KB Created: 2021-09-23 04:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8e063d7637a7ede20d1b0c421b7831e SHA-1: bfbd5f566f494816d7edba531fff748782fe4c7a SHA-256: b0b00c0aea376f610fc7bdd2450795153a7303d95ff95e9b8a6a212c95280bf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=essential+calculus+james+stewart+pdf PDF link annotation
    • https://rt-totaalafbouw.nl/userfiles/file/62235815869.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/merurikofoboz.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/94660893552.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136460ddf8ca---50564308727.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/70749549843.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/zedan.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/19456619389.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/jezozisuk.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/lunaz.pdfIn PDF document text
    • http://slsnn.ru/content/file/38166775524.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/bijenodewirutuxirusumu.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/ribewewogisepid.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/damagega.pdfIn PDF document text
    • http://ausafe.net/images/art/files/11751283106.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/fijuvu.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/javelisegugixod.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cphqs2gk04g58280bthd1tqrvs/supenefisawowo.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/xunisudidododajasejosujus.pdfIn PDF document text
    • http://rjt1.org/upload/files/32153409745.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/gunijevogefiraj.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/79742322469.pdfIn PDF document text
    • http://cwesp.biz/upload/file/37439520832.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/jonanotu.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/22874346307.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_off0000bae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE4 15900 bytes
SHA-256: b49f57bd8920a3433292f9111df41db6c7441b49c7de936d25ba3d6f7bdd4a01
font_01_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10960 bytes
SHA-256: b82bdaf3c5fcdb2995af3cd5a122a68137c7a504765d48b05c0cf4abcc66b257

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