Malicious PDF — malware analysis report

Static analysis result for SHA-256 5986bf5f05414ea9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 09:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 759dcf89ce461c07211829779b49bc6c SHA-1: a2133b97dbce0808dda90516f9f4fde0a52c79db SHA-256: 5986bf5f05414ea9b216f4955334ced533ab06def9e0531044b11e81c9393dbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=corocoro+comic+pdf PDF link annotation
    • https://ssvacancy.com/ckfinder/userfiles/files/7398536064.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/ligisonag.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1863583d---vanalanufejemugok.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/74785060306.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/60471789232.pdfIn PDF document text
    • http://becucci.it/userfiles/files/54967292148.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/90160203958.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/76914811363.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/fajadumugof.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/94026472993.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/13017145722.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/puxopuxufulasanijopibaru.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/92187622014.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/jixewimogiluronu.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/medegesedewat.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613576c8af3d6---fixozivu.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/susapidorosewifeninuvaz.pdfIn PDF document text
    • http://esistore.be/userfiles/file/fijukup.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/wuruvoxokutifemanobemupes.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wurezojuzajufekidirifi.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/7147539808.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/siwasulowaji.pdfIn PDF document text
    • http://artistprasanna.com/userfiles/file/finukoberoruk.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/67069876730.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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 10100 bytes
SHA-256: 177791daf6ba50deda8784e9cb4e995c6425e073a77bd4c50de811a8279913ac
font_02_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 17604 bytes
SHA-256: 3de011e9672e4b542efdc18463ab6feca608ea442d0f0cccab40ee0a2708680a