Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeeda3ea42b50a9c…

MALICIOUS

PDF

115.7 KB Created: 2021-10-05 20:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 20b998634488e8d0b3041ac1ef7cf4ae SHA-1: 17a7329f3fda079ccdfe72ebca283571969a8563 SHA-256: aeeda3ea42b50a9c8d4e6cf3ee1f91eb014a2fd8aa2b99a44cb4864d9ed02aeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sanaspinler.net/calisma2/files/uploads/nozabavokabufa.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/barimelomejifak.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/wumuwejetesudozanu.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/badetu.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/redodirek.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/vogowikuremilozeriguf.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/rixizopuzoja.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/16929729052.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/15182455565.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/jofotasetonuximomo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac1185ab---60284638599.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/famejajuv.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4243939f---49660236868.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/bunijagebovezar.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/nejewusij.pdfIn PDF document text
    • http://peintures-descours.fr/fichier/files/11370501719.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/85637517719.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/86710849329.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/24098276546.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/61463017153.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/jutejibusudefinenozoguni.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/28792469963.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/81636844523.pdfIn PDF document text
    • https://noitiethoc.com/userfiles/file/69992044970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=baby+intestines+outside+bodyPDF 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_off00015d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D34 10504 bytes
SHA-256: f973324171dd1024a98a57bb9ef1e69a98bde32d18c2196570e3935a00cf70ac
font_01_sfnt_off0001754d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1754D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D5F 20236 bytes
SHA-256: ad1bd6b8c9e8f747d58aa636a46080779863019d973b40606cbf336b52282fe7

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