Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9be913f8905b8d8…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 19:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93cea35dfc7b416bcce4fe3446a628d5 SHA-1: 66686f4870194ba68e8c03025327f86bd229e1d3 SHA-256: c9be913f8905b8d87b4dbfe0213c7c3ea0abd095d50ea65384b5f524cf30d867
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to create a network of redirecting links. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=endgame+online+movie PDF link annotation
    • http://philboyd.com/66782207034.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/96311305451.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/jutulowotiveselifaz.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/jomelibajefaroxorupu.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/pogefezafotonexikewidukad.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/ronobefikowulef.pdfIn PDF document text
    • http://4darchitecture.org/img/all/dusabinojaw.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/gefoxawexotumopife.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/73746012180.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/wisuzasijiririligelivixof.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/070448327642.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mubuveleluf.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/38366994746.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/dujedumegesomeveg.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/816409139.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913142214330.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/64550167545.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86085459404.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f1c47aabb8f6a167cc10b95b497a356d/nuxowut.pdfIn PDF document text
    • http://ping-property.com/user_img/files/lurimanapisukogu.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/21709454557.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132570b3d129---48576578624.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/kefivibapamanavizes.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/kojufipibamegonuruzener.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_off0000b6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BB 10272 bytes
SHA-256: e6917e4f965867579638df1bb97d7e1738e6f20f6f93eab9b9eb427bea21bef9
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 15784 bytes
SHA-256: 12690fc41a2b89638b0fb589bf5ad07ee41137f7428570e8ef4c546062b33134

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