Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e74f498448cdc31…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 21:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16b76cec1ac07bab84dbed75f04ab34d SHA-1: 7553ae62571b7a8c296e294dbc3d3795fa6ee27d SHA-256: 6e74f498448cdc31006e1794fc6111b2f0b2ed02b754787ef36de08ee205d656
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the 'ML_NYX_PDF_MALICIOUS' score strongly indicate malicious intent. ClamAV detection further confirms this, identifying it as 'Pdf.Phishing.Trojan'. The presence of a 'download button' lure suggests the user is intended to click through these links to obtain a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mrhobbscoffee.com/images/uploads/file/7456508458.pdf In PDF document text
    • http://eventclub.pl/userfiles/file/87241321564.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/zuxapegorexokigoxizuveza.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/wuvenukejojixexidikipipat.pdfIn PDF document text
    • http://voijin.com/userfiles/files/daxez.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/jurivuvobet.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/finezejovowopurukirexeli.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/nabelanadezibumux.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/denuxe.pdfIn PDF document text
    • https://sainaudit.mn/File/52609522960.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/26311251348.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffee19fc3---78645742515.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/11307561237.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/26802437015.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/32447782051.pdfIn PDF document text
    • http://sdes.in/uploads/gazegoju.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/xojerisudorid.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/dojoz.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/gonub.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/38356298946.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/sopisurik.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/galejesarevodafenunipeg.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/mebuxiposadoziku.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/48877580452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=principles+of+marketing+kotler+ebookPDF 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 11056 bytes
SHA-256: 338c94cec9ebc07b5c7472f6d77fded4e5c9121f80fe37d03c618541366d7795
font_02_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 17984 bytes
SHA-256: a01ee5b081d3ce0a3f415d17e9346d40b9737374e88bc65a69efc782f1a212a4