Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b59247a663fac2…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 02:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83b516108679a6e305c8c146ac09967b SHA-1: 4a393bd8560bbd054f875555a13746ebe5e99ed5 SHA-256: d9b59247a663fac27dc9d090a984be2081c2d870fc506970b4b613fb85f6122b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs, many pointing to disposable domains, and one heuristic specifically identified it as a link farm. The primary URL points to a site that hosts numerous other PDFs, suggesting a coordinated effort to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://stilistspb.online/public/files/uploads/files/64910126613.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/getekisimekezeloni.pdfIn PDF document text
    • http://cartopack.com/Images/file/ruvinamalikor.pdfIn PDF document text
    • http://santabruna.cl/upload/file/30517179324.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/52586685129.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/tololorevufafizam.pdfIn PDF document text
    • http://saimiri.name/upload/file/jegusobibifobim.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338ca32fe5f---56091147218.pdfIn PDF document text
    • http://saaretravel.ee/images/file/62991710805.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/38617879089.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/tawapavevanibemudujug.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/vevelodibiru.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/wujibifinu.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/96917135190.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/bukelulasegepilokiwasaloj.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/61513784372.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/xojoliwureposuvotegig.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132bea6cf4f1---32489675602.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gozagenisokid.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/92463718859.pdfIn PDF document text
    • http://seritour.com/rsm/files/54480207197.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/96543924627.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/vopexeserir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sistemas+operativos+para+dispositivos+moviles+androidPDF 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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 17432 bytes
SHA-256: 244d6f053477fadb0e32c7b22324ce1481b05d8dfbbfad2e67ffa03b5b4ed8cd
font_01_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 10696 bytes
SHA-256: 0401cd4a32ad3245f7616ce011177de867e683a97bc1ac09d9a2d96212845f0d

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