Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e342b5010ba164b…

MALICIOUS

PDF

99.2 KB Created: 2021-10-09 06:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99248f68a1b1531bef9e80b39bf8c693 SHA-1: 3ca5cec010b2a5efff3ac90ebb3e399a8354837c SHA-256: 7e342b5010ba164b5a4ba95d68389962012eaf2d0c7ce5131e58d2bce2acd546
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs pointing to various domains, identified as a link farm, suggests the document's purpose is to redirect users to potentially malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nghiepvu.udicmanpower.vn/uploads/news_file/64977551049.pdf In PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/vizilumikeme.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/97508637478.pdfIn PDF document text
    • http://stylekd.ru/files/15100966410.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/41458035730.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20211003_9EEA2D94D0C7F714.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16160784bf4168---17255885843.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/26736060956.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0im8d1voke7r19n80s7aiaa2vn/sipefirurotamewateguleri.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/4669442271.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/dakuxubujatobelebab.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/ludafaxasebemotavitudu.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/kapufixukas.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071701328829.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/18650145879.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/pegilogamorevetidozowenes.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/zijojigeduduzebad.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/fikasomitoriwojalu.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/64912916729.pdfIn PDF document text
    • http://classtool.info/upload/files/95530576687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=navy+reserve+personnel+manualPDF 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_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 19784 bytes
SHA-256: e02737778809804e6e8b5eeaa587e0a2778bf8fc470929be1234b293217ec5f8
font_02_sfnt_off00016775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16775 10480 bytes
SHA-256: f73e8c5b7e76b08cc5978e1586d30cbc7ad75181d9fb72983c370ba639731222

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