Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7406268009f578a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 03:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 310c1daf662788b73ffa60abb07124f8 SHA-1: 2f8a3bb81a4bf40cec5cc676ea850e59e4dd7d49 SHA-256: b7406268009f578adf763655a1b5bc3411da33bde3f42e451c2c86a52e2ce93d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier strongly indicates maliciousness. The presence of JavaScript and numerous links suggests an attempt to redirect the user to malicious sites, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kop-trans.pl/uploads/userfiles/files/lowosuvemezevujiz.pdf In PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/53892128055.pdfIn PDF document text
    • http://vhshf.de/File/675858177.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tokixesanazonojej.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/7763874365.pdfIn PDF document text
    • https://mikludava.lt/images/files/fulawetaxobo.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/4093184559.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136aab5c2c31---15852338213.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/97068055233.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910135214.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/logawiboko.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/popegenunujod.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/53287955076.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/18689431473.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/99967920901.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/8693579621.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/75200194215.pdfIn PDF document text
    • http://splogservice.ru/content/file/41446996698.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/makekuxugideloxusatelilo.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/suteratanulupesejefavej.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/88620108183.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/3456880359.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311ed85df6c---samemegovu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/guluropeponika.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48231955374.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/mevixufufasolufawinedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=skam+english+subtitlesPDF 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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10744 bytes
SHA-256: 297810659a6a0c67f7faf2007d526d7c43943e56989d52830a143d4d7ed27dcd
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 20720 bytes
SHA-256: bab9c12f0316e43d965e6aae5d8f535cfbb95480025bf2f79fbc8475d752715f
font_02_sfnt_off0001335c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1