Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9559a46276ea2e0…

MALICIOUS

PDF

88.1 KB Created: 2021-09-21 03:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 194e6f230d77debbaec1dfde2e4ab961 SHA-1: ea5380649c7ebab31e25da06e10661490ed056fa SHA-256: f9559a46276ea2e04e446c4dd9fe1c8b0d21f6309982901c51c4445fc94245a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple external URIs, many of which are disguised as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown reputation URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=goat+simulator+free+apk PDF link annotation
    • https://jensbrode.de/files/file/99427855228.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/57677257863.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/70562306580.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/melofi.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/tobavesipuxariwasixi.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b96d48151---degasetoxoropifonag.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/58156863037.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/nuzajuxuwonemanerimigum.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/18872583059.pdfIn PDF document text
    • https://seikai.jp/free_images/files/fexojanewadexowotizaz.pdfIn PDF document text
    • http://apple888.vn/luutru/files/26884244593.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/4770620048.pdfIn PDF document text
    • http://lobi.md/userfiles/file/81411290729.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/67059993092.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jaxuzolaxa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cvjukmgsg0es3003d10d19c1b3/rolid.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/59593915730.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/memilodiwi.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zodagixemoz.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/23465294921.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/degabipumexegafaz.pdfIn PDF document text
    • http://deforma.it/userfiles/files/87760796767.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nidesavolesarox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 23608 bytes
SHA-256: 69a405e6cf80bd5bf667cf17f7673590ff432fa130beb52061cb34b621663819
font_03_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 10648 bytes
SHA-256: 7673f97da300d469433b7aa3304ce01cd43c5ffed9e77e086388bf575d8fba97

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