Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c6a18b59ece979…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 05:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7900f8fe9660b950001cb876797a719 SHA-1: 15d1764bb5f1b8d65be538947b5ec48f3bc80eaa SHA-256: f7c6a18b59ece9790a38794315eccc33e4cee0a082e86cd9c097cc4748235b44
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://lauraestetica.com/userfiles/files/zixorada.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/ruwofo.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89224623912.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907210956642452.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/palulobedukafojal.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/99143356861.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/4222072565.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/74783810377.pdfIn PDF document text
    • http://saint-party.com/media/file/84508747812.pdfIn PDF document text
    • http://telecycling.org/files/file/33765663367.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/26917720873.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/86919234756.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/vikewixininuzus.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/bajuverulot.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161379c7f077e8---94020270609.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sununijofuvozisukipapo.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pozopenesovomiminumuma.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/32556922432.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/nixub.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/keziliseputegulaboj.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/sugiwoguzenazu.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/35578744658.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210904142017.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/rebonapidofixob.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a5301a1657180902ad7c6b98b298a2b1/rumuroselalarel.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/10878203916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+how+to+install+apk+from+pcPDF 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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10912 bytes
SHA-256: 5afce0bd35cd9e19c3acc38242b706587ab9adddba527581e6047f76cd10783f
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 24084 bytes
SHA-256: 02c1563020f6b50eb10b913c9d57b563451235d80af04cf878f37ab77a3fcf54