Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5c72ea07931513…

MALICIOUS

PDF

89.4 KB Created: 2021-10-05 15:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b818bf7cb088444c54669bc488e5838d SHA-1: 109a9db20cbbf45ac33092ca7774e8adecc32edc SHA-256: ca5c72ea079315139814467bca10b74b59c5b3fe13c06181362f35a29cad45be
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which are likely disposable or used for link farming. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to redirect users to potentially harmful content, possibly for phishing or malware delivery. No scripts were extracted, but the sheer volume of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 4

  • 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.
  • 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://pistant.ru/uplcv?utm_term=military+reserves+meaning PDF link annotation
    • https://travellifeafrica.com/ci/userfiles/files/daguribaxof.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/59991731588.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/guwakuxoxufeximitekepusa.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/44238900178.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0232c70e33a0eaf805be6c69e88ccc6a/60118908701.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/tiripifizi.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/89937958469.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/19845739873.pdfIn PDF document text
    • https://linker.tw/files/37508792060.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/79207680693.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/jezededidirobomidoboverux.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/81336032416.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc27c591b5---xezujoroxupelemonokupe.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dosoradezawitemubepe.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/muduzale.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/60566854122.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/88368122804.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/gewanabimapasisozu.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/letetuv.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/01/86478963751.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/guzakinagotulizemak.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/90027481229.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/kejipegaxoxatenep.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_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 21620 bytes
SHA-256: 92d0440c5a4a0db9920bbfaa2e56c1d379d3cc4290a80b30cd4dad486601c9e1
font_02_sfnt_off0001405f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405F 10504 bytes
SHA-256: 075839876195c7654d0780d1a29a69a777818d4dde274cfc594816fab082b9f6

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