Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7ad099490575c8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 17:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 741f66b450434ac3f6b29ed2e001049c SHA-1: 1c991ad95b416e72d171eeed97c1a70989655812 SHA-256: fe7ad099490575c8e837e3d0bf9de7d18950dec958e601b3adea5933081ce761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://rafaelokazakov.com/file/58288109311.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jojaxevatew.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/82071517123.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/73859626342.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/86770252141.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/zosogudovew.pdfIn PDF document text
    • http://toroisg.com/public/images/files/90587319639.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/jozivanuwafivatigixujij.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906095319370.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pinegof.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/karigisekajola.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/42687811170.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/tabejif.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/35557510989.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zifuligokizom.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/54729023085.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/22788225590.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210907_71ABF6C290E84EAA.pdfIn PDF document text
    • https://kimcert.org/E/file/favolukex.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/32619187056.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/65198681416.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/jinevoxusorexurata.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/81840519152.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/zarafuwozobesojinijejetor.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/38414382529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+khutbah+jumat+bulan+dzulhijjahPDF 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_off0000b98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98A 19644 bytes
SHA-256: 5ca54aaeb0d7cf7e17f432586062ae02f54314c1278666e3f1a3fb7efd499b74
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10620 bytes
SHA-256: 656e4f5e287f1c0c9e448b4bc317a4ce1f2e1810ee8367653a08a929d4ab1a78

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