Malicious PDF — malware analysis report

Static analysis result for SHA-256 18df1fa035f7efb7…

MALICIOUS

PDF

83.9 KB Created: 2021-10-12 07:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fb5e1945e8e988707853b797899ed6f SHA-1: ac01170704d7625f933b29d2454b4cd3099a1c50 SHA-256: 18df1fa035f7efb70e861952668135a85776fbbef7c0367880602b93c8c90c69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

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://coretry.ru/uplcv?utm_term=multicultural+diversity+in+tourism+workplace PDF link annotation
    • https://dellrein.ru/content/file/87942313754.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/30377072217.pdfIn PDF document text
    • http://dakov.hu/_user/file/dodamewewidurabopuvesuza.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906200915.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/28588586994.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/38193939479.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/lofutidenoxopuxuma.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f0edcaee---11988694079.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/jazewejetilonuberajutitor.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/fupagowumenoledosixedefax.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/50693938955.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/37713559729.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/42960654225.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/vapamojuzematowemoz.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/mefitowozelevegetoner.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614091b9aa833---metunuru.pdfIn PDF document text
    • http://mailcontact.jp/uploads/files/ximuxibowo.pdfIn PDF document text
    • http://thepartybooker.com/userfiles/file/7897948778.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/48929140192.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/61226096208.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/tobubod.pdfIn PDF document text
    • https://griffithnorthsideapartments.com/ckfinder/userfiles/files/12444493917.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/subuvegisituvosekorut.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/22820132230.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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 11124 bytes
SHA-256: fe41429f16d89d99a07f987bedd04e4c5a3598bf0611617008a6b44a6dbc296c
font_02_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 18432 bytes
SHA-256: 81827447faf7bc732f6cb961f4f6a2f016c2f4e418dd6c134f99ac4ff65516a2