Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c21cee20af33e36…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 19:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b24053f7d6beb66c925d44659e8fd5ad SHA-1: 48482d1d3567a5efdde8310bf253487aad045a82 SHA-256: 4c21cee20af33e36992a08b9ace28b1ca35fca0470fc0a745de46b5c0e558454
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/kdj03jc6j3k0jq2kupnrabcsi4/niwibijijar.pdf In PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/lijenawaselonokujedado.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/puvigelovi.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/kogurakuwotez.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/50620685424.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tifigasugepalexijide.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/vikubujozaxupebiv.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xebola.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/85469506069.pdfIn PDF document text
    • http://thevalleytrader.com/files/nubol.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/dibomimajumubotasutudij.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/92492083993.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/tebixap.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/puvumunabopove.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/donizuwefo.pdfIn PDF document text
    • http://dogable.de/userfiles/file/lebekasogox.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902085005.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/bagipamofuxumubuvowa.pdfIn PDF document text
    • http://exosushi.com/uploads/files/vifemadufepupas.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/xiseworadatarixusizo.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/42637224147.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/mofosobunuziposit.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/pegidoregukizavopub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=note+9+pro+miui+12.5PDF 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_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 16156 bytes
SHA-256: 95a50281cfd413b92a311ab09d1011816c822ece4820853cee699c90640439a0
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 10552 bytes
SHA-256: 231c74ab311a668dee134de17b691c1782e88e9abffea421201824bdf4525117
font_02_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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