Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac70a264960e5c87…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 23:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28855752f79b898d7aa4f9d6d8ca7a50 SHA-1: e55391a9978de7dcee16735290668cd03907e73e SHA-256: ac70a264960e5c8718af3cd3d99602606eabb987eedf929e7c07663128a87718
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=avengers+endgame+online+putlocker PDF link annotation
    • http://lavalnerina.com/userfiles/file/guperola.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/mozul.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tesofamibunazevavowoj.pdfIn PDF document text
    • https://thietbigas.net/media/files/vovipijaxenozuwati.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nagapetub.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/wepiwuloposumuxo.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/fakofelipowibagalijufixam.pdfIn PDF document text
    • http://att-na.com/upload/wuzupawif.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/sotutumasobukuf.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ee931eb9---16830959541.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/fotemawazuxaxivigulepuw.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210906042000.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/10060170628.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/91936191360.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/36675896959.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/30772518719.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9ceeba152236393d917c9fe32cf26ffd/voxedugekokugekin.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/movavexuruvedu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/podivifuxaba.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/wexakurusatewazor.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/fubepulegapebagadezo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 17564 bytes
SHA-256: 644f10650e1ba3675fc8578f274b4185b1c08ed7b835307812d67d898f7d9f87
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 11096 bytes
SHA-256: e6f79f7425e7f66eb287dcc83d6d6b155fc4bf1168be28d341bf85902a766aa2
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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