Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e9c5bd209e0056…

MALICIOUS

PDF

73.5 KB Created: 2021-10-01 19:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3d314aea5d51b463d4d30fd12acec237 SHA-1: d0f24bf215a84c359c5e1743019cce36c8362ccf SHA-256: 87e9c5bd209e0056c9237d7272062084e871476b075fdbc89933ceba643afa57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest it is designed to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dae-young.kr/upload/fckeditor/file/99780154750.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069585d815---50430633168.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/79891769384.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/kenikodez.pdfIn PDF document text
    • http://cncsprings.com/d/files/bikuragosuz.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/44972163604.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/22253561506.pdfIn PDF document text
    • https://serka.com/serka/upload/files/7775354936.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/12522593444.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210918_114633.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613223d3295f8---sidakevilokiwubawipa.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/38929610580.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/forogaxezegepevumigexurex.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1632866250.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/dopejabexat.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/pepisose.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/nakenujasemarigapibiv.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jodofikeralatejuto.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/34934225779.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zikawoniwavuwo.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/wujawasifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=deleted+photo+recovery+free+apkPDF 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_off0000b848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 18608 bytes
SHA-256: 7838a130c39631a5f2f7d4b7cf87d94392b047805ed0843dcfa16cb6605d6adf
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10624 bytes
SHA-256: 80bfc73229586ea8f4997e6f4c7b54b567deb7d5d3191882dddf8b279ae522b8

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