Malicious PDF — malware analysis report

Static analysis result for SHA-256 60617a22564ff2af…

MALICIOUS

PDF

92.2 KB Created: 2021-09-13 04:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4502fe7c37f08fd9a29485a388358b39 SHA-1: 63560e2e23fe5d532f6a97e984ffc9729dcae44d SHA-256: 60617a22564ff2afcfe0a88f07788cefedd30a64491fd7fd1f1891370f7c4f30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=sexual+personae+camille+paglia+pdf PDF link annotation
    • https://cleartunemonitors.com/ckfinder/userfiles/files/85768648184.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/jesijakevozutirogojemog.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sudesirorukoge.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wolejerenuvukife.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/besurutagol.pdfIn PDF document text
    • http://holzweiss.at/95935153456.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/vadekit.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/45109433212.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/5029882159.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/25738112252.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/gipuzujaxegakogedowadom.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kewewazum.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/fevuz.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/51213453295.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/vasuxidaja.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9c499e173637b266a59a346a02f2d43f/xasosuverubufadajofameti.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/kiwinakur.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/kotalotufevadakote.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/68030424724.pdfIn PDF document text
    • http://sireny.net/share/files/zutuduze.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/sededukusibewitonaruwoput.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/19164529315.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/verowuguzinivazakeregado.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_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 19192 bytes
SHA-256: 2308a55d3243bf1f4e55854982fc74453a5a3e442c9a56aa6177fc4a4d525a23
font_01_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14975 11140 bytes
SHA-256: 099282d197a18825c8cae7598bdb4eea125534bbca053dda63fcfe5c4d58a04e