Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f16111cac9e374…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 06:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39e2b339fd7e3800c1eb3894a02deb6c SHA-1: 59d0ab7b8d5e83ab543e0bd38de425be94659768 SHA-256: 98f16111cac9e3747ddbed49e49fdaceae55e441b929ef22b20402d3b0cd1820
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is likely a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://togclick.com/media/userFckfiles/file/44407739594.pdf In PDF document text
    • http://p-itos.net/admin/userfile/image/file/88201430164.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/wabifuvenukipusarovuli.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/80842022338.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/74625250402.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613221cecb1fb---1085748537.pdfIn PDF document text
    • http://eventechsite.com/files/files/vifagunu.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210909031102.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/wuwobiwojogubarewen.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/voduvapem.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/tevokejomutajuzabewikod.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/24361443293.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/fuwetolazinexobezatelunib.pdfIn PDF document text
    • https://themalc.org/files/file/sanobosotinojajiwadek.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/vuroxiwuduxumevukojavob.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/vezimidagorexuvajus.pdfIn PDF document text
    • http://toroisg.com/public/images/files/19604820618.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/50677986412.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/60036688298.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/kibike.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/fusetiramapiva.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/wifamusujonos.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/47452080597.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/54884433472.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/fekamonanilagotibalo.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/67552909141.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/87553126296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=software+karaoke+untuk+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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 10484 bytes
SHA-256: 64e02e219c82de56de4a13d91596a1f184fb235398bc6f44e475de0d023a42bd
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 17080 bytes
SHA-256: c480dc5d26663fa6749a1bf47513bef6d4ed053ae5cfd865d52b642f6faffc26

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