Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d397a3c2461b64e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 07:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd306eba9c42829fde7d20d409cb43cf SHA-1: e2fa2e420b6771edf85ee1d5d00b2aadd7456216 SHA-256: 5d397a3c2461b64ef9926a673b2949cd9116f844e9c7d4cc1548a91618861e4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lexconsulting.ro/webroot/files/media/57454397992.pdf In PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/tasozojoruxukilowenisi.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/3316104116.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/vebujeguwer.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/44842412055.pdfIn PDF document text
    • http://carbontuning.ru/file/pefoferas.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/madipeliwavinazufidubepo.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/54208007123.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/roxoxifuvenizatixojegeza.pdfIn PDF document text
    • http://ed-union05.ru/files/file/7185776090.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210917_3741F7C41F83A730.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/20/zokoxokizabisexamudutot.pdfIn PDF document text
    • https://kermanrooz.com/img/files/jegetevafoberuxil.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/68590805110.pdfIn PDF document text
    • http://olympusflights.com/files/files/korutaxefiwutike.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/duxunefokome.pdfIn PDF document text
    • http://tianfonmm.com/d/files/52516457006.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kadelezezudevogonev.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/zowemogurilefir.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jilek.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/61035222383.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9b0d46822---batugamimojuzabufabipi.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/memuna.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pumorikikimejubedemuvaviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ludo+club+unlimited+moneyPDF 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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 18544 bytes
SHA-256: 03e1773f1975d9bdb92d145d2d89a80a4aa557deb22588f4e7262f1cde847ebf
font_01_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 10412 bytes
SHA-256: ac9ff2105096f2398699305ee5370f02aef3234e131330f1f0432cb22c6b2c6b
font_02_sfnt_off00012fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1