Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1df4ae17c062147…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 17:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bbff4f1c99c59430c46b97b0b2b71604 SHA-1: 38eac76b7869415a2a3180b1c5d28ba168d797c1 SHA-256: b1df4ae17c062147b38707a47feade33e8cc1046e2d3947c0349f2560954aaef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to manipulate search results or distribute further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://issaproject.com/app/views/panel/ckfinder/userfiles/files/70454630310.pdf In PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52683090956.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oluwenajaj.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/27477595954.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/puvafawajuriwo.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/58701449189.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/rodasenipusadi.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/81663785226.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/migiduvukurifununejib.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/diponog.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/58536969696.pdfIn PDF document text
    • http://hiniceshine.com/upload/guxedovotuwa.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/tajape.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53baa90bd---wekodu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/57374942927.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/28394752567.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/gupugixizominolobepezef.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/lapudasekazeb.pdfIn PDF document text
    • http://ecme.site/upload/files/98103607495.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/5326758469.pdfIn PDF document text
    • http://savemaxint.com/files/file/54355978445.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/96217204641.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/wudamutebateko.pdfIn PDF document text
    • http://mp-journal.com/media/file/56382350364.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/42297148181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prince+of+persia+classic+for+androidPDF 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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 10516 bytes
SHA-256: 1efd369c98d7bca4352c436867ea0d0060c5a2eb9b55e4c1d5b045447896c9d0
font_01_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 16664 bytes
SHA-256: fd7496734fb8810c57baa68e494418ca9662d642bc062630ef58c02d4047563f
font_02_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1