Malicious PDF — malware analysis report

Static analysis result for SHA-256 9532c8d4ad873044…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 11:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c27aa5391cec3073248dc5dafa01e5e1 SHA-1: 82eff662ca45d52cc961383f66bf8dc22b79e10a SHA-256: 9532c8d4ad8730444bbd662a78ca57487e896b75c8773d752d8707d8f5a53667
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing or malware sites. While no scripts were explicitly extracted, the presence of many embedded URLs and the nature of the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sikanderajam.com/Robinson/ckfinder/userfiles/files/gexereke.pdf In PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/lolokaxirorofufaxogurefi.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/89533003817.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/40647787023.pdfIn PDF document text
    • http://hueide.com/upload/files/bivagerapu.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/tulete.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/bumimesavazezawiwa.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/novojizuzijotijubixizala.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/dipujatowusipexaseliziga.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/56610353258.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/jobebilir.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/19793327613.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lipazefule.pdfIn PDF document text
    • http://yjccnc.com/upload/files/57237753540.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210922232944.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/76625550529.pdfIn PDF document text
    • https://protum.se/file/73194105969.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fe55e7dce---titunuvababe.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210914130757.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/48716807817.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/52907949068.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/loluveneb.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/xurujilikutewekevedo.pdfIn PDF document text
    • http://stpogfzz.com/attachments/202109/editor/file/dujezudof.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7hke47h2mknj6fhqla56ulnis7/dasibumelibofubuxufos.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/gudaxejanavaponotexut.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/49220966820.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/vevupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unzip+on+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_off0000bbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAC 10276 bytes
SHA-256: ac5cd2aecd7e1bd3a54fe2710aaada260469f1d3fe23478a7e38eb0efa1e8da9
font_01_sfnt_off0000d2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 17636 bytes
SHA-256: 6a4371134edaeb961ee25f122653440c2a9da90c40b2b0b9f6e5e39e61ac677f
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1