Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a62ed78e8ca1422…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 11:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26d13e54e0a77b789dfbc62e3b124672 SHA-1: 6d9de11c6e087dea7f29c36c3dcc7b3d2d5f998c SHA-256: 6a62ed78e8ca14221915b46c0fafd2d318a2357cd1727d933ad847b224d12cba
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious and contains a high number of embedded URLs, many pointing to unknown or potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, suggesting a phishing or spam campaign. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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://perfumes.dropship-tracking.com/userfiles/files/52255220732.pdf
    • http://sjzhtchem.com/upload/files/betorozapaluge.pdf
    • https://novinfasteners.com/userfiles/file/8488598838.pdf
    • http://kleinschadenexperte.de/userfiles/file/98175112997.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/22100909708.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fb217b302b139366426596a436d145db/penipubuxanibil.pdf
    • https://premium-house.uz/images/file/zilofugimitub.pdf
    • https://bawauang.com/contents/files/63128584584.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/70296230512.pdf
    • https://btsis.com/upload/ckfinder/files/79395323333.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/1704020745.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af45a9737d---gudiwejegive.pdf
    • http://designerhouse.ru/upload/files/zegakaxaxagipu.pdf
    • http://mitroc.com/userfiles/file/gujanipobuwipaw.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nosimizeguw.pdf
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/ranakefawepezokowusatow.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161350b8cac4f8---vegure.pdf
    • https://rrr71.ru/upload_picture/muvuxu.pdf
    • http://petra-koparki.pl/Upload/file/paxoduv.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11523015845.pdf
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kezanivuvinena.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=my+hero+academia+season+4+full+episodes
    • 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_off0000c004.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 16792 bytes
font_01_sfnt_off0000d81b.bin
76a0556149c1ce32e9b5f7dac38eaa860c852bc182534f1e2c60aec59447d45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 11072 bytes
font_02_sfnt_off0000f1c1.bin
ad7f7d5e7676dabe934407dfc6d47b6ba1ca882b94903dd550c0c28202ffb987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 20160 bytes

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