Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6223bd5140fe4e…

MALICIOUS

PDF

76.9 KB Created: 2021-10-02 22:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a773faabd4135708317588af4685382a SHA-1: 6d5f19aad310df962068e22ab414ad7abf07131d SHA-256: fc6223bd5140fe4e903585087f49174d1bb4c6e0d0a3044e6d232e1d6a2ccc47
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, which is common in phishing and malware distribution campaigns. The file's purpose appears to be directing users to potentially harmful content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://best-of-geldanlagen.de/userfiles/file/tokukidajekatog.pdf In PDF document text
    • https://atputasbaze.lv/images/userfiles/files/nobibu.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/fifugakep.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wetejuzavibawum.pdfIn PDF document text
    • https://cristalensi.com/public/File/xirobibigob.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/nimubupedowawaromax.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/sinasusofuxoxafavito.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/62664194078.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/197853449061466487ecd18.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/90917006228.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/jibagogo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/88522940093.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wowesajararajof.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/bamazuvobo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6163a4b2---6091410861.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/mijasutodu.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109091504202458.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/tefan.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/vidufovafe.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/tonajejijus.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/47782831528.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9931ea8a---70601145015.pdfIn PDF document text
    • http://nemochem.cn/upload/files/zonexoximuro.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/1272205246.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/79845605462.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/45330672479.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/24260741639.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/88394127769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=network+topology+ppt+for+class+8PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 16288 bytes
SHA-256: 9954424b46dc065f47093ffe172a384685a1e866c33df8b2f306fbb8e1043070
font_02_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 10936 bytes
SHA-256: a7860d6af50bdc842b54f6725052e826281eb828e420227a01b9b0afbed6cfbd
font_03_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd