Malicious PDF — malware analysis report

Static analysis result for SHA-256 11126580510765c8…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 13:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de35d91aa6188514c1fd6c002158ea9f SHA-1: c2df24427658a10fd1484ba50a50758877c1b66e SHA-256: 11126580510765c88add0e6bf1d73a4359f5e7b41a389fe8e2eac141f6b22a4d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI heuristic and the numerous suspicious URLs extracted. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests that the linked content is designed to manipulate search engine results or serve as a distribution point for further malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=stickman+zombie+shooter PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/82146191935.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/71514485960.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54348384056.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/12/29322019264.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/20710694895.pdfIn PDF document text
    • http://bamila.vn/luutru/files/73962181342.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/petitemema.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/setamarawawimus.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/85404772852.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/48567874954.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jariwusixatotisas.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/88717187189.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/redavejijo.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/gewopolubumijevolumuza.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/19944486452.pdfIn PDF document text
    • http://epicridesnepal.com/files/sarigezoviz.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/34306529473.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/68276465223.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/44972090712.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/xewuvo.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/vubipodajud.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/96827476948.pdfIn PDF document text
    • 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_off0000c0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 17172 bytes
SHA-256: 5848ceda34d1f2a8c5e083b07807daeb37386f94ba80136af2dda7143b7945d6
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10816 bytes
SHA-256: 442f35dff8d7f067eae08e8bae7261474fa30a5c9d7b9589e0fb69a342b48ef9

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