Malicious PDF — malware analysis report

Static analysis result for SHA-256 555e3750f3f7621d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 04:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7e6b82fed6b854522a42534e920ad0c SHA-1: 1152302ca2cf427b577e4259fcf601d334bb578e SHA-256: 555e3750f3f7621d8aaa4c6bca440471dde6f438649914574d9503a5ab31aff1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs point to various domains, likely serving as a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://plewmal-d.com/Uploads/files/jiguveguzuvepopevejuzadab.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081a6bcde5---52305563502.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nuwuzepodemevugev.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/jurivapofalido.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e925d8760c---wibadapumekuxojoralubow.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/67428886669.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/doregedu.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/32998628044.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/tajozosegewesanunumikasax.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/fopozenuraxirujubi.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/82049330222.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/31361340862.pdfIn PDF document text
    • http://zeci.nl/im/image/99289098181.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/9534860330.pdfIn PDF document text
    • http://hidramaco.com/files/files/mokejatoviduzigaguzen.pdfIn PDF document text
    • https://atiksigorta.com/files/moregevisawus.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/xexegerajevi.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/lefefopivemuk.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/xofivowu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/48822167843.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210909001837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=keyword+ranking+difficultyPDF 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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 16908 bytes
SHA-256: 0164db594adb4aa5f4b48fbff04db789c80c295181238a4fe31954ac1a1c578d
font_02_sfnt_off00012f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2C 10864 bytes
SHA-256: adb2e7ac8f3fe8a63523fdd1c7600a418f40e13420abdeb10f4974be18cf7364

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