Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3ef4df747fb1b1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 13:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28f18502d2981c85b2b6a3a3229f2122 SHA-1: 8c0fc4f88372b0931712b9470935d522b7ee6cd4 SHA-256: 8d3ef4df747fb1b183e8b2dc0d803fdbfde88550a5f57d6fd2080183ccb9cdf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common pattern of luring users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=the+layover+full+movie+free PDF link annotation
    • http://danchrisjewelry.com/userfiles/file/mibimuduf.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/lupujivixubenutolozirik.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631441666.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210919_08E8D26A3E98E40A.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/rolajufoje.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/51691725269.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/45776684406.pdfIn PDF document text
    • http://budropol.de/Upload/file/xefitalebatogidunojowibaf.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/59465351748.pdfIn PDF document text
    • http://gestioniarmatoriali.it/21383079173.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/luvabakiwezojinujotimoji.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/gawofusipuworavuvo.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/78377804850.pdfIn PDF document text
    • https://medius.sk/userfiles/file/92268243078.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/7532454787.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/7386046394.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/3867803509.pdfIn PDF document text
    • http://synowka.pl/galeria/file/20973774103.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/pevit.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/sigevagudi.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/jigelosap.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bemazimekubibexolise.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/64394116671.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/marexisonuz.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/72381846804.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_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 17792 bytes
SHA-256: be91fe6eefec790ee94ee73d1f7adff0548b37ddb8ca9a44ac575680a3655415
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10352 bytes
SHA-256: fb4031f2fcee36c05955d34782f89571c1b2ea8dd27c631fef09d46acf2380d4
font_02_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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