Malicious PDF — malware analysis report

Static analysis result for SHA-256 652e83957499d26f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 10:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95aaa6d4e868cae1cd43c1b7bbc14174 SHA-1: 88f91faab3f31bf57a8c4af4d0229da6ed967da9 SHA-256: 652e83957499d26fa1210227cc67eeec44e03f1801fd92e02a8eaaee56ea2422
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect the user to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/wikimenixaziw.pdf
    • http://gymostrov.eu/gymostrov/userfiles/file/86150309314.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/92123452666.pdf
    • http://www.mousumibanerjee.com/fckimages/file/22864426865.pdf
    • http://www.gulbaharsigorta.com/contentData/file/vojekedavivuguxozapod.pdf
    • http://chiaranannini.com/userfiles/files/jukujiwoxesuwurovizebe.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5c68582d---bivikifexaledunazu.pdf
    • http://gardens-spa.com/user_pict/file/49189132549.pdf
    • http://lacasedescaraibes.fr/file/99164893358.pdf
    • https://butyfarm.mm520.net/userfiles/files/muzujovoxa.pdf
    • http://originalcheck.it/public/img_admin/file///sikotowuzawujulupitu.pdf
    • https://kangaroovietuc.vn/webroot/img/files/vifakesibepodam.pdf
    • http://ballarioarchitetti.eu/userfiles/files/vawojifapizi.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/kugusiranugapinojup.pdf
    • http://veewood.com/file_media/file_image/file/61933619403.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xakumejolexajeku.pdf
    • http://email-database.info/userfiles/file/toxila.pdf
    • http://www.rannatennis.ee/data/upfiles/files/gerilavovekukasadenamupiv.pdf
    • http://all-premium.com/user_file/files/43805880317.pdf
    • http://zeroseistudio.eu/userfiles/files/88898973468.pdf
    • https://graphicart.ro/fckfiles/file/11128483897.pdf
    • https://granitabrasive.ro/editor_up/kuwusotasolijiwul.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-10-27-58-31.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/36066118654.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=office+365+smtp+settings+ssl
    • 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_off0000d598.bin
5b2c763e5462b20cfb3f8747107c16f80a5943c54ce3df6dea784f790d27126b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 10940 bytes
font_01_sfnt_off0000ef02.bin
175c76a0d57b4c21371994ad60d2e124e97410350872325405da11344c29c02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 18552 bytes
font_02_sfnt_off00011ff8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16792 bytes

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