Malicious PDF — malware analysis report

Static analysis result for SHA-256 da288c3af1176436…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 21:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba99a9a406f6609760d8b01219272578 SHA-1: a5d512c2674ea15954657a2cf5bab0104b1018bd SHA-256: da288c3af117643629a114c49ad6c1b1f50044506c8926a2ac18708e4ed4067b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to this behavior, suggesting the PDF acts as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ukrfirework.com/images/file/gudomakaxovasokis.pdf In PDF document text
    • http://recit-de-vie.fr/userfiles/file/28560489881.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/17853740243.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4a324917---tepegiluxafe.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/62466319931.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/bafuzufaxatumi.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/78313626771.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/30693534014.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/54096357991.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tiguzuwosejenagakubam.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/nojexirat.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/75216537298.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/gufuzile.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/25196889278.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/bukutowanobon.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f315fb3d465913c058b27628ec142542/70639677002.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210901083835460.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/fifimejuto.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/vijepepemojajunilager.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/rusepebugulagexenodul.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/36517771339.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/sinavekukamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=interplay+13th+edition+pdfPDF link annotation
    • 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_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 10716 bytes
SHA-256: 49cdb965567ee30c9820cfcd2096979196132d15bd742d18727090149b8c2d99
font_01_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 17736 bytes
SHA-256: 1b44ba68b4398169e2ce266a2023b8bd05dbdb3ddf09826004d92543a59fd921
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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