Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e271542606b7d9c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 18:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0ba04cbe37197a0e74469481c905f7f SHA-1: 9551bc6df4be9cafb9613f4b41b8552bfa454133 SHA-256: 0e271542606b7d9c2ed275239bec934cf9e79c09a00bfffd93074721f780fc2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=the+big+bang+theory+season+1+episode+1+download PDF link annotation
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/76905912522.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/xekijixifikeromatomonowep.pdfIn PDF document text
    • http://thongthien.vn/upload/files/donejifusovorizexewok.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/63007731190.pdfIn PDF document text
    • http://rs-entp.com/upload/file/36773660898.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/13875637798.pdfIn PDF document text
    • https://fasleh.net/Files/files/4402563551.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/96179327994.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/44870416366.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/92282156779.pdfIn PDF document text
    • http://youil.org/userData/board/file/kavodegefujixanizaf.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197205022268.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/36418219289.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/wolalunupozosebotipibasi.pdfIn PDF document text
    • https://huanghecables.com/d/files/watevisolaranu.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/51441386755.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tokafutov.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/21538925462.pdfIn PDF document text
    • http://japhina.com/upload/file/rezeximepajolerekuj.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161401da0177b7---10328470226.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/lilafajodevamuf.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nmbjbo6qdmkkv0u5o56811q6km/22735042755.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/10758334976.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_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 11028 bytes
SHA-256: 5175104dead43c86490f59d45f2e2f90838dc1008d44c48f3580671621e10b80
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 18620 bytes
SHA-256: 22554c7c3667e0d0e5330eb8aea50d994830d4e6c8c3f975f357b4c7b6b2829e

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