Malicious PDF — malware analysis report

Static analysis result for SHA-256 287399c575473616…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 01:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87aa403b7348bd540f676f85b490472c SHA-1: 7ae26251209f6b35d3e0939c6b7410acf4bddba8 SHA-256: 287399c575473616a4efe6eec0ce2bf73ef85a1ac249950df4a4d2df7edb64f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and using UTM parameters, strongly suggests a phishing or link-farming attack pattern. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=mx+player+all+game+hack PDF link annotation
    • http://laclonghotel.vn/upload/files/xuwugesavowajovexitakel.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/52548753907.pdfIn PDF document text
    • http://emannsltd.com/userfiles/bulej.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/rizinugurito.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/3995268451.pdfIn PDF document text
    • https://anfauglir.com/images/file/88458117141.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/63035387212.pdfIn PDF document text
    • http://hanifeugur.com/image/files/vugusozidabirirebuk.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/58157162101.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/98216039255.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/92513736935.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/perorujijomesazupo.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/sifozinaxod.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/80525824848.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kh2c8apbjkp7khracgngmfmle6/sewimikazuvo.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/39017559454.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/dedipemesevogudil.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109012153555010.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/titixeguvowatejalepesasoj.pdfIn PDF document text
    • http://lblussana.it/images/file/18479450786.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fdvebjegrf52diqmvs3lqi8911/35445187030.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210908121205.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_off0000b5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 15944 bytes
SHA-256: e92d5c5a74287bbb629fcef7c83ce4a7c4dc96868a903c81ba61bf672ca80c86
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 10540 bytes
SHA-256: a49a123047c8eacefb43371443f2d16da9c6fd29f55858d4acb96c68bfaff816

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