Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4c20eb9ee3c968…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 17:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b85953bdde76a84eb014819dc4701af6 SHA-1: 66a228fdda6c402979d1cf63778220e78f036a3d SHA-256: ab4c20eb9ee3c9689de94358013d2a021bd49f4ba92e2eb6a36777353e722c3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rioairporttransfer.com/ckfinder/userfiles/files/gonufijogupivawuwen.pdf
    • http://morethancars.nl/uploads/edytor/file/38925170692.pdf
    • http://byecook.com/ckupload/files/39319691042.pdf
    • http://incomingmakedonia.com/files/files/68037390229.pdf
    • http://j1ent.com/userfiles/file/20210914122535.pdf
    • http://baracenter.be/userfiles/file/3721311892.pdf
    • http://turnyras.lt/Files/file/92876338568.pdf
    • http://aktifithalat.com/resimlerfiles/37102135337.pdf
    • https://ykitraders.com/UserFiles/file/kegekepebirofepiko.pdf
    • https://marupyara.com/fotos/userfiles/file/rizag.pdf
    • http://vnationwide.com/userfiles/files/zutenotinewavoropipipi.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e88e55fe85---27464876463.pdf
    • http://www.jindatunnel.com/up_files/file/rimiboxiku.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/jedufegosifubevizer.pdf
    • http://hoteldanang.com/uploads/images/files/51416469750.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/79593454053.pdf
    • https://cheeselicious.net/UserFiles/file/kitegagorijaso.pdf
    • https://stvorki.ru/files/file/16144195550.pdf
    • https://transturist.ba/ckeditor/ckfinder/files/files/60124818003.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210918091323.pdf
    • http://upasamed.org/Content/uploads/files/2405998530.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/29795989966.pdf
    • https://mudraconsultancy.com/uploads/files/95982357064.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=justin+bieber+ft+ludacris+lyrics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bafa.bin
030b8376bb1a32d558831a17f35a1fdc81ac04ebb8055f3e62fc9cde776c78ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 17616 bytes
font_01_sfnt_off0000e890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 16792 bytes
font_02_sfnt_off000100a7.bin
74ef0bc121015e1ee821bb9ffb174fbeeb6679d0a90f075571fa711259a7dfee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 10692 bytes

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