Malicious PDF — malware analysis report

Static analysis result for SHA-256 0103378eb33afee4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-09 15:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3683d1b4be984d4408a3130655618bcc SHA-1: 8670083bcc4f24e8c1ee64a7e3091fb957fde373 SHA-256: 0103378eb33afee4e974138315a9ff3dc7150d90c7030fdfc182e7efa9e519df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, which is common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://quetthe.com/upload/files/46285232792.pdf In PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/punufasejutixonoso.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/dudozuvofe.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/89982151285.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/5883575606.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/duwekunakusodurugapob.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/28184035694.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/forez.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/35507469805.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/42249542339.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/61484287180.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/lavezexev.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/60168616050.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/tugidudeg.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/faradepigudizalanen.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/fipizutatulosoruwopol.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/gutux.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/49190055533.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/bixul.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139068b3b86b---tojabonafubixis.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/pejugopajavawusevodezeti.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/refiwewesavemile.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/54033916598.pdfIn PDF document text
    • http://taigesw.com/upload/files/89446263100.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/mivaduborulafexujibik.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rovafakejarugepudopi.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/31021860087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pyramid+bloxx+androidPDF 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_off0000b42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 10368 bytes
SHA-256: bffe079193422aefea1ea7459976111e62870c89fa875be9ae2829b2ce827ec9
font_02_sfnt_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 15188 bytes
SHA-256: 52e851f483fd6a6c18ce068799aac4f2022972c99a2f591c2da7beec5e554f1b