Malicious PDF — malware analysis report

Static analysis result for SHA-256 04485d64965e6b1c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 09:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74b0fb91acc90b52a271d95e07a44ab5 SHA-1: 72c530f2ac9da81d186b43974e0983841d766701 SHA-256: 04485d64965e6b1cb5380d46904547f644fb121f3999fe4c455a9c4c1bd4e97e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead users to potentially harmful websites, possibly for phishing or malware distribution.

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://chcial.ru/uplcv?utm_term=naruto+shippuden+ep+373
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/43d67da67ed3cc4aee31a0372fee9007/42591834098.pdf
    • http://melly-incendie.fr/img_db/55411718054.pdf
    • http://qiuyutv.com/userfiles/files/20210913011405.pdf
    • http://hanasushichoice.com/uploads/files/5730939732.pdf
    • http://hondatayho.vn/images/ckeditor/files/mutir.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb3a32f8d---58612359122.pdf
    • http://polimak.pl/userfiles/file/ruregiv.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/wepupegixapug.pdf
    • http://pevak.info/UserFiles/File/wegixirixu.pdf
    • http://stepasidemedical.ie/images/uploads/file/kevamekowerozafawagusimos.pdf
    • http://a-kamen.com/userfiles/file/79357710003.pdf
    • https://rireenfrance.com/images/upload/files/zumazikes.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/nalorav.pdf
    • http://driscollandgibson.com/images/edit_images/file/vasukojijedeladuze.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/wejetezebosusopu.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/pipitifitulinepekojof.pdf
    • http://romanasulcikova.cz/userfiles/36066267893.pdf
    • http://compow.net/ckfinder/userfiles/files/gadexizeleluwewivik.pdf
    • https://havilahbuilders.com/userfiles/file/20117827390.pdf
    • http://camonetinternational.com/files/file/23593136321.pdf
    • http://qiuyutv.com/userfiles/files/20210904123816.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/9491150045.pdf
    • http://gonzagafood.com/userfiles/files/xofudonevemozagegid.pdf
    • 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_off0000ef9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 16792 bytes
font_01_sfnt_off000107ad.bin
fae80bcfc6de73d263c1d5754ad1425c5589d795afef951f0df76ef75c7c385b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 21404 bytes
font_02_sfnt_off00014003.bin
44c7a2b323d5a3be1858eb02589827740e938724430346359751fe3ec080c1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14003 10740 bytes

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