Malicious PDF — malware analysis report

Static analysis result for SHA-256 885b85bead3c1b48…

MALICIOUS

PDF

87.6 KB Created: 2021-09-21 13:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a607f48bc51cece6a8f56bb77ac46d9e SHA-1: f087d25bcc907476786add6bcbf3b913aab2eece SHA-256: 885b85bead3c1b48c420253c9a06336f2e474d002d3d83c416a5e7af9e2d8a4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to manipulate search engine results or distribute further payloads. The presence of embedded JavaScript indicates potential for malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synthecinter.com/userfiles/files/31609813314.pdf In PDF document text
    • http://revucue.com/ckfinder/userfiles/files/mojoguju.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4130aa59---fujosijogufir.pdfIn PDF document text
    • http://cga82.com/admin/File/kixexozefizenokadazategos.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/wipolopuzuziji.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/kesufazasuno.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/dovovujebonajotejot.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/64709184016.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/86793037094.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/jigijufazefexo.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/95761094057.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/23329452233.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/filubovusozivapu.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/53813249063.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/26081793593.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/41838270324.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/11247448102.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/97598435293.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/44325418488.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/gumegimuxazip.pdfIn PDF document text
    • https://cargobull.cz/res/file/fetuxolikuzojiginuwoxeli.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/84626854504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=designer+application+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac9379818---xaluzaxiwegodo.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_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 10692 bytes
SHA-256: af0a38583f94b020b09c8faa4f6f50543708eef64ffc86adcf7924daaadccf6c
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 18864 bytes
SHA-256: dbaf8eacb76a2b0d909b9eb01f1d38587f90ea0003e4a06397eeddd0fff6765c

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