Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbae67ee39d76ee…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 01:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db986213c42a9149e180ebda7e644a52 SHA-1: 28aa037b4917e8387ccddc301b9957fbdf4a09fc SHA-256: efbae67ee39d76eee739118427df139364868535141744a20e4c81916acb4374
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=s20+fe+one+ui+3 PDF link annotation
    • http://ivankrivanek.com/userfiles/file/toworuleguvuw.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/41510842126.pdfIn PDF document text
    • https://swiz.eu/files/editor/91353563369.pdfIn PDF document text
    • https://masukpt2.com/contents/files/xulozanewofet.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wesuk.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/joxasewojamisakakiwerejof.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/50974982011.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/62907914918.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/992798127.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/nunaxewadogekajul.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/68297339121.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/febomurabanakujavodo.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/gexagatutu.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/xewoxagipoze.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/49716182466.pdfIn PDF document text
    • https://brs.jo/userfiles/files/34521414427.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najenaxef.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sibajuruwugafadafiv.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/pofosufeguvizubogobu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/sobazeduzijoloreleru.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/vaxebalexasol.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614fde303db4a---fokuxebi.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_off0000acc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC5 16424 bytes
SHA-256: 47d8b93d420e64d1b8bb9ab84f47cc1fa5f62f6a4e1fe08aa26e7ddcbdc03632
font_01_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10224 bytes
SHA-256: 63f7be1428c1376797193b7719dd336142d164c8c81919e1698b04775c32e862

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