Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed434b0603e0e6d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 10:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9aa5fc9865139ae055181984580511c SHA-1: a2a1f7b461a39e8f4a2a9a105793141f7a0f8598 SHA-256: 8ed434b0603e0e6dde6fb93827f0effa5ffb61d67c3e426e1807a5a2f986dc11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, indicating a link farm designed to distribute further payloads or conduct phishing. The presence of embedded URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ksboutlet.com/file/files/1560281394.pdf In PDF document text
    • http://www.gdchgs.com/admin/img/files/sinudulawiwamepibab.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/jijot.pdfIn PDF document text
    • http://inica.org/files/file///nixawonup.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/xogesipupojigu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/judiwavofipi.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/24312109737.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/90983997869.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/wudenesidamibazuxade.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/29269213355.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/59315181258.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/farogosiwikekerevuwev.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d87e0a31403361a32bc18f079e24c641/91615318805.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/73486729809.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dbcfdaa8f2db7c7b78e8c5fabf183059/neguladinikumoro.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/48503856472.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905105832_3dby2l.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/difoxibesoropaxa.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/42213902744.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/pikukamuzoki.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/54961206656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+live+net+tv+on+firestickPDF 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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10704 bytes
SHA-256: 0819032752fd9c7cfa0cb6063ae95f4b2e7c787154a6c1c6d4d850dcf87204a5
font_02_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 17704 bytes
SHA-256: 5c142b8bc2c3735b42199a746b11e87c94ef5e691b9753267e65e6ed3edefbb2

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