Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca507fdb3bcb094…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 11:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c1088efafa1a5f980caaa3c9588263b SHA-1: e256f9cbab547812a6ec6e2c57535072c2d221d0 SHA-256: 6ca507fdb3bcb094ca66522531572fc3d3d01c5e39dddd5efbf09942125dfee2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://lovepetclinics.com/file_media/file_image/file/suxilasitawi.pdf In PDF document text
    • http://steffis-strassladen.de/userfiles/file/16779236627.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///misejazebaxumixekatali.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/roduralekarep.pdfIn PDF document text
    • http://haki.vn/uploads/files/75964568498.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345d62794c9---rifuzabijafazidemavadino.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/rinifadadax.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fokedakududup.pdfIn PDF document text
    • http://z500.si/files/nupibufawana.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/nomoliwijugifoviwiwebolo.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/kegolujis.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mufafugilobojapipozav.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091301262573499.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/kalexajejavexumasetenozej.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/97584783085.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135595901983---32222737008.pdfIn PDF document text
    • https://stopserv.ru/files/file/xidafusakekopudoxuvewaxav.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/56262287050.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/nuvujavekinofu.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/98589857516.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/53983364496.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zivixukideninobuxaf.pdfIn PDF document text
    • http://hiniceshine.com/upload/42589658767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+hack+pacybits+20+for+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 17704 bytes
SHA-256: 30adfb3f22f61f07579287c0ba4b66faf847bb0e61aa90f8431898e10bf30024
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 11092 bytes
SHA-256: 5af42b8c2b9d59efec02c9f42629b797d80205209075f5b40e7ad67073f6b360

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