Malicious PDF — malware analysis report

Static analysis result for SHA-256 776c5655df61bfca…

MALICIOUS

PDF

72.9 KB Created: 2021-09-30 20:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa299ca777a3f3888d8d3b9eb31688a6 SHA-1: 8bb8931042c277a502da61170287847d6e34c42b SHA-256: 776c5655df61bfca610a99a691c13665c7fad695e7f3ec954ed99fdd66289414
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious with high confidence. The presence of multiple external URIs suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=king+of+fighter+97+perfect+edition+apk PDF link annotation
    • https://bya-ingenieria.com/ckfinder/userfiles/files/85793170682.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/lananowugo.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/91584180041.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/mediruverenijitiluduvit.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/povavigipaxurolemaj.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154571aefda7---xofebunivowikexoledom.pdfIn PDF document text
    • http://progetec.org/userfiles/files/kijufuvonarotapoliduseso.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/1642519217.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/baguxomuruwiwamuxilugow.pdfIn PDF document text
    • http://bakoca.hu/files/file/rorelofadunam.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sapukawamuzijeremoka.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/xugupinazabiritog.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/nuwizunometawomikab.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210925161809.pdfIn PDF document text
    • http://cke.hk/userfiles/49154738026.pdfIn PDF document text
    • http://fluorescent-training.com/file/48129626284.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/59461112951.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/43047730359.pdfIn PDF document text
    • http://novafish.it/userfiles/files/zodatomiki.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/29599400104.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/69145037684.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/39386486591.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/31452785130.pdfIn PDF document text
    • http://gibisch.biz/files/files/vujutulabasipunalofoba.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_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 10984 bytes
SHA-256: 856262db50fed5896a3490ae3b50c4812da2c68b6e563e664ffd55bd3c6a7916
font_02_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 19336 bytes
SHA-256: 954ba5eea3c46ac71500610c2f7ce4534c8e9b24b81ecc151ae431657287de10

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