Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbfdd98b8e97867…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 18:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 243c9d05b65d70cf7c6963046051097f SHA-1: 46f448a00b03d0ebf88aaeb156047c73fdb0e1df SHA-256: ddbfdd98b8e97867ba3cf655a62b3809f2e34d7c688e95c880368f300f9050d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/95n1opkrabr9uat722rpj8o6n1/bamikimodop.pdf In PDF document text
    • http://kutyasturak.hu/images/files/tigesuxowiropedux.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/78035610985.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/luvefazetawenosovilolow.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613476e70f9d1---18711335778.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/76614294435.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/kitufevebezulonewixigovin.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/ludozixikopagakipegusekup.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/gosekuzofuwuvemerorivube.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/roguzose.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/81816253090.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/89618047021.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/51741198353.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/zidikurewaxex.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bixopiwumelavusosenarire.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/pexalaronunojejukixazik.pdfIn PDF document text
    • http://itena.si/uporabnik/file/pagapifomisawakerukagur.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/pagage.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/tugizisubex.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/bevele.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/52111335547.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/powedubapel.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/53349957058.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/30059651167.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/govagunumefudafuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=shadow+fight+2+unlimited+gems+iosPDF 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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 20148 bytes
SHA-256: 8c206dfff30fa57f7eb12c627a22529502f9911c94943b3d125dd4cb8162c5f8
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 11080 bytes
SHA-256: d1ca74b7007f1c379d24c86513654ed04fa571552e257ebc8e99f2cb3b2c34d9