Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45648836ac4501c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 00:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8a81583f455123542f8592e4c97548b SHA-1: a6922aa797acb0894327aaf68701fe793967d006 SHA-256: d45648836ac4501c886e0052acda0e14a7dd08aef1f0ffc5cfa593e8c0f51b3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=stealth+marketing+pdf PDF link annotation
    • https://lean-ds.com/upload/editor/file/nixutugar.pdfIn PDF document text
    • http://sentralperdana.com/file/90221205111.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/34005312380.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/67067403332.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/58468287643.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/80748995742.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613926dfb03d0---sitebotupezawoweriza.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/46095404248.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/44941048578.pdfIn PDF document text
    • http://cpviettin.com/upload/files/93255157015.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4602abb8140e669cd277f21fb1e5055/99220428577.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/sefatupusidasuxodapemu.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/66307277785.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/zixedoxejovonarunurekitop.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/keluzibafevitow.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210905_215230.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/kinegedekotamavetozameko.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/10799112698.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/zozofijaxome.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/gexozarifirafozobo.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/xitupojalenebulob.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/boxojevixuvenutema.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 17848 bytes
SHA-256: 344237cddebeeb5e2933e8e2722ad36a0afff429784a2c70a86564df344c850d
font_01_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 10824 bytes
SHA-256: df5b3f7c86558664249addc5da590a517a00b9b08adc7c0fc7c2f97890e185e3

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