Malicious PDF — malware analysis report

Static analysis result for SHA-256 065d5f29ec1f4a72…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 17:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a0f9ec98a30ba461fc7620730b17461 SHA-1: 1edf39b8fbaff8afb9bfdc7e53b2fb801b63d268 SHA-256: 065d5f29ec1f4a726fbce535494edba5aab7d9e1d2cfec91e852003a5599d57b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior, indicating the document is designed to host many links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://doublehair.center/upload/ckfinder/files/84857901304.pdf In PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vaxen.pdfIn PDF document text
    • https://2acontractor.it/images/file/53236123551.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/bilidebudin.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/69154917980.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fozesofigebitedoziwogos.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/33484547915.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/dajititiwuva.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ockf8er8p84hnoara1godv8vnb/tituduxoni.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/norokusizi.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/nixelusujuvezekif.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/fupumezitofako.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/mewafexosumu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/wofige.pdfIn PDF document text
    • https://raghuvirtrading.com/userfiles/file/xibozuxeziloba.pdfIn PDF document text
    • http://24cvety.ru/upload/files/10726714081.pdfIn PDF document text
    • http://savemaxint.com/files/file/fipivigoxosegodi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/53865499026.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/23975073445.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/30329532236.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/junekepov.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/felubaxejenagikobedaxobel.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-21-05-45-14-61.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/kufera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=photo+lab+picture+editor+face+effectsPDF 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_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 20104 bytes
SHA-256: 2a2942bf95a45dd98cfa684381a00c9247787da198cc10f2e45c2dffbe9d2cdd
font_02_sfnt_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10856 bytes
SHA-256: bf0729719d478142d2328c104656fd52a62a3985e328d2094c48e6606c005b0b

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