Malicious PDF — malware analysis report

Static analysis result for SHA-256 83259e68c9db3beb…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 22:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e272da0cd8b2b2958a88ce058eb1f80d SHA-1: 389288d7855320e715d3af6a8f7dcedbc015015b SHA-256: 83259e68c9db3beb04e3466f11c688ab73cf6bc1e3a0b07c41d905e7cbb8097d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The presence of external URIs and the classification as Pdf.Phishing.Trojan point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mobile-translator.eu/app/webroot/media/files/19421851467.pdf In PDF document text
    • http://faisaltowel.com/survey/userfiles/files/satojodofojesikag.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gapupunujugonilemujaxifuj.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/15958660045.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/19679019581.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a933adc47---kumobadaweji.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/magiditoj.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/koluvupadodewa.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/mazizufedixetowizazul.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/wirugefiletasu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/2346367663.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/3624817556.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/39397557912.pdfIn PDF document text
    • http://esangsok.com/upfile/files/bolifimefok.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/lolebi.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/rejirovesalip.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/mudojiwuk.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kitesefixujap.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/15566038058.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/xazudageroxisun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=redox+potential+listPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 18560 bytes
SHA-256: 81e793ec6ec2e8796a250556107cfed31b1bba2c3b864850e4a83c9d44fe625e
font_02_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 10432 bytes
SHA-256: 65ee155ede9b2722725e652fc9a072ceac950623910dab86e787bf3ef79677f3
font_03_sfnt_off0001426f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426F 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78

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