Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e0ff929528f524…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 23:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df79653996aef0d953831a306aff13a1 SHA-1: c2178283989df925749337cd68d0a3d4c3104d9f SHA-256: b9e0ff929528f52456a643d8f5f4c3e2c3dba53b307151f8aed4ac9c39c27bcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection scheme. ClamAV and ML classifiers confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=which+gun+has+the+highest+damage+in+free+fire PDF link annotation
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/23225413910.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/68680692761.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210912170451.pdfIn PDF document text
    • http://haai.org/upload/file/80595898986.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/44305290922.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/57346516444.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2065909818614343978904f.pdfIn PDF document text
    • https://hobbypet.cz/files/file/83509338558.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210919182314_pn5h46.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/takukibogopu.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/37403463221.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614516c5397a5---80817541285.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a17690ad---20054376893.pdfIn PDF document text
    • http://360global.ca/userfiles/file/7687201285.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/gepowurolikevusofu.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gimupizobutabop.pdfIn PDF document text
    • http://dytac.hk/userfiles/76887118114.pdfIn PDF document text
    • http://melvin.cz/data/xabanupeduneg.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/85953254271.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/8095937122.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/gorufosipite.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/faxuru.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/tawawukugona.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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 19180 bytes
SHA-256: b6b2b4ac8a1f2310131f6e6eff61eae192d4fcec35c25db425c8fafb8712192f
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 10848 bytes
SHA-256: 19443ae81ec473ba04678a1a444679938d228b76b55c858de8e0e2725a0f3501

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