Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f60abf9d3d4cf0e…

MALICIOUS

PDF

67.9 KB Created: 2021-10-08 20:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5dcab5899b417423a97708992ab71346 SHA-1: d187e68ca3662522983777c1adcf4da21adde958 SHA-256: 9f60abf9d3d4cf0e36c520f7a6e8e12cc8ddebd49e29f2ccd721c454f5dc46c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=the+elasticity+of+demand+is PDF link annotation
    • http://aci-immobilier-douai.fr/userfiles/files/61643619518.pdfIn PDF document text
    • https://afayl.com/userfiles/file/17637648996.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/raxozobadenupitixerom.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/dulufuneririkunerelixi.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/xumexujodefemozu.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/rofojosajuvatal.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/gotunulogoluligebiba.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210919031255.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xumuxuxegipigugemumi.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/folexiworifosenuvusibuga.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210921144319.pdfIn PDF document text
    • https://redac.ch/upload/gelajunimerapizogiduper.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/13009672365.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/5292050963.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/zadidimuzule.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/61003130763.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615383d5ba70e---30127392140.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/92164310309.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/66360456295.pdfIn PDF document text
    • http://waypl.pl/upload/File/12024283212.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/29782171833.pdfIn PDF document text
    • http://muratay.nl/userfiles/file/95582201363.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_off0000ae6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 14404 bytes
SHA-256: 10e9e076a21fce797c16a093370d7cd830064fc94f0933ccb4a8b03785e9fea1
font_02_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 10716 bytes
SHA-256: 842bf42b224f5b70738d32c3d6f71ac2c7f41537690e557eb18e1fada0eb4e70

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