Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a6f44e99e40e6e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 01:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20a1bacfe70fda5102f0ba5471d2bb45 SHA-1: d9745bb5228ee090a4e495b72e3cf06a52d7bb86 SHA-256: 67a6f44e99e40e6efb8faee4d804bac23f75ce1016d5eb95455c25b08952f25b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, with one heuristic specifically identifying a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a compromised site for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thegmsbihta.in/userfiles/file/pajitiba.pdf In PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/81274826373.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/67636207618.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/35680595821.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/4164857768.pdfIn PDF document text
    • https://dcimx.com/files/bopubaresexapafetaluki.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/87322065501.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c941e650---8775627101.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/rurigegomugifomozagu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/34649601168.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/lunite.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/63630348038.pdfIn PDF document text
    • https://triosms.com/userfiles/file/jonide.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3797c4c1bf073c948279b83cd070c5e7/34481342652.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mogomemadawufomexapiz.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/vomujixiwebutetoduxi.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/bexisadutonowonali.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/93070002127.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/guzizezisugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=multi+storey+residential+buildingPDF 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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 10768 bytes
SHA-256: fb8c2440ac3bb5fe7c70e54cbb77e9f7ee60ecece1759d78e3986df4d5e9e90d
font_01_sfnt_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16544 bytes
SHA-256: bc9bb9584109d16277e5c369192e8dca72bb67caa664a8bf81aa7dabd5b8a00e

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