Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1672eb7040ea28b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 18:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 419927364beb3656b9b6898e783b24dd SHA-1: 4db362ce6530aeacd50138d2bc216045e8f61a26 SHA-256: c1672eb7040ea28bc531cf30f6de257f2405615fe100a1c1857a1e11e1a06263
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, flagged by ML classifiers as malicious. The JavaScript likely attempts to redirect the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The presence of numerous unknown URLs suggests a link farm or redirection infrastructure designed to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ustunbilgisayar.com/userfiles/files/77741187834.pdf In PDF document text
    • http://fukaofoods.tw/uploads/files/202109011516416003.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0909/8b436e737ec0a13eb89c85364468da06.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/toruguzuforido.pdfIn PDF document text
    • http://stattus.com/assets/file/zotasamakomagiwom.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/fijudovaz.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/90035128337.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/bewedapetanodus.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jodofikeralatejuto.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/ruvirolofukarisivutovix.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/58647143121.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613028fa4b415---51921837460.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/11932752358.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/40189403214.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/70167056322.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/44348316641.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lazorolexiwix.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jeboderevavitoz.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/dopefade.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/kiferekizunijor.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144cea86daa6---78656885392.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kemufizevisiputidedobubuz.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/99785530560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pop+up+notification+not+available+in+your+version+of+androidPDF 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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 11036 bytes
SHA-256: da0135165e56a249ddfca6df41974ae4cf13e22557beb31b8d745f2d088e508e
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 17792 bytes
SHA-256: 1a39a4a3a8e056c608a0d485e0fac3b724917ddaca8fd65383a154f8d3a9ce35

Open this report in the interactive analyzer, or submit your own file for analysis.