Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a7062f08910e08…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 13:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac5cff1439f960fcac798b932756005f SHA-1: d363b5f4ba297128ffad5c136474506842c1b696 SHA-256: 06a7062f08910e087299e3f528e30f65d1a81b245842dfb54097b87911907696
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a large number of links pointing to disposable hosting, a common tactic for distributing malware or conducting phishing campaigns. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://insolite.lu/img/userfiles/files/siromajisuno.pdf In PDF document text
    • http://penetrat.ru/files/files/54837052042.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc65cd120---litumuribivubolowiluvo.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/duzivodelugaloret.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/57352344401.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/mufuwedolobelofedinoripol.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/xasanavereposelowibi.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/sugiwoguzenazu.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kerutelopiga.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/dewapip.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/kalokanuvabewovap.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcda35615d---metokokido.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/nejunov.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/laxagitax.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/xunakulovuguduwowi.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/sozifinugolob.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/63867019219.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/49797238840.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/26442825135.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fulavokizijonomenekufufu.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/62742126058.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/11572430831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apk+youtube+playerPDF 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_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 10308 bytes
SHA-256: ddb20fec99a58b682dc6b51a74916aad4528dba86fc7a646ec965a43fabc6652
font_01_sfnt_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16632 bytes
SHA-256: acdfb6ff100f9a96024c2f750eb4e7fab040e4db4b83cd07bc9de7d2f27def4c

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