Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aaa24f82b25840…

MALICIOUS

PDF

106.9 KB Created: 2021-09-18 17:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58bde0b42f97f3a8ed07f24661ab4f7b SHA-1: 1aaeb72725f925ac6d94e36b93aa5cb4403b70aa SHA-256: 41aaa24f82b25840ba3364e44d090ed763ccd70345763ff5c446583c703f9778
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to obscure the true destination or spread malicious content across many domains. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pannonfinanz.eu/editor_up/zanegewajawev.pdf In PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zomipeki.pdfIn PDF document text
    • http://zamgph.com/uploads/file/031411075231.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/sowulajixasapakinedebe.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/kejun.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/lemefodaxufotidufemizu.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/64383748793.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/nubewekifugolujexel.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vamege.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/gajubifawutobegowetu.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/98878304432.pdfIn PDF document text
    • https://istanajp2.com/contents/files/75235899662.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/welamusu.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/17477905709.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/domowegasokupanu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/42312144941.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906210200172997.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161362ce3dca77---21474465258.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/mawumekolabulol.pdfIn PDF document text
    • http://benetalent.com/upload/files/vimimalojo.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/lufetewamitotoz.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/dimugujasakowaka.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gewiseduvozegojija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mm2+pet+value+listPDF 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_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 18928 bytes
SHA-256: 775ce5d6bb122be4a55762f4a48c6492050a9536d80229cf7f1a666f2a58fc93
font_01_sfnt_off00016e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E7A 10368 bytes
SHA-256: 3d27b60e6f80d826c714074b09c56b3baf18e9565a491c23a57521543c2537b9
font_02_sfnt_off00018607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1