Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c77c382da2dd86…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 15:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e5d1d6a43dde80d84012abf57c18a17e SHA-1: f01ce3c184274b5573538d0e8064788140bbc151 SHA-256: d7c77c382da2dd86771f4e0d2f1193965e5262732db0241e62647cb3764915e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=among+us+single+player+unblocked PDF link annotation
    • http://0975811252cool.linker.tw/files/nuwuxuk.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/dixomagagegabinusolebusuw.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/xalazakesixi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/92612641006.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/bekenis.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/vozujixofiwonakaseteb.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/wekaf.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/jipusazilaxi.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/4321035674.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/lanoxaf.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/14270796884.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f75906e2a---32620597169.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/3446960706.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/34073975920.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/7183645635.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/dorusefe.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/42039939002.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/47356216794.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/21593957960.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16144583510be1---43204351773.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/temoxazuvonefezipigevob.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/kefuvufomevemu.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/medavufarojutozulap.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/87736545902.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/degezulezeseru.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_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 11188 bytes
SHA-256: 2b365f8558a6576967277d842195d48411d560db1110277888fd94989aec6e9b
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 17504 bytes
SHA-256: e7d80a039decbbe59e7ce166d32b79d55ba0ef33926d278ebf20f03f5865db48
font_02_sfnt_off0001371b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1