Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0165e9f1b904e3…

MALICIOUS

PDF

94.1 KB Created: 2021-09-19 05:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc28d12927d9e07732dcc978f35e13f2 SHA-1: bcde90948c21b96be5eaf864da3e602c62fed16f SHA-256: 4f0165e9f1b904e33982e9576020c916d2fa74341f716cd6bb5cd36cad2e4507
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, characteristic of a link farm designed to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as a malicious PDF.

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://pixomot.ru/uplcv?utm_term=roger+brown+language+development PDF link annotation
    • http://techniq.ae/admin/uploadfiles/file/1581326707.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/linek.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/muxobeweluginijul.pdfIn PDF document text
    • http://yuli-china.ru/d/files/najupikigofimusujewageki.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/92803334623.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/86114402702.pdfIn PDF document text
    • http://sakra.sk/storage/file/3401991002.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/94455312772.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/susaru.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/popadoporazikojumavapom.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/49514930446.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/59562257572.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/wutupegepazesopa.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/mijoruniwutaxudoloko.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142419cc5532---kapaxowasi.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/dumejojudojeluxu.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/wopezagukadubedofewivuma.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/jovilasupuruzidowo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/74595677718.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b48b3ee16---42033593458.pdfIn PDF document text
    • http://espwireless.net/uploads/file/57327307368.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_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 10912 bytes
SHA-256: 59b9c72f3743d42c2e1abbdfe8c426db16fcbfc90f0049e5c34734cd64858a93
font_01_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 18484 bytes
SHA-256: 5d89f9c6a49631653aed37a2bfc4a632d2761a5ab1a18d8cad9fef1e6023f66c
font_02_sfnt_off000152e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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