Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b324cb2ba56d778…

MALICIOUS

PDF

103.7 KB Created: 2021-10-16 04:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67f0faf8c7eea598527a4f5d12dc7530 SHA-1: dcb69433acb56d9e3f5aca1ab3bf3677e5f7252b SHA-256: 5b324cb2ba56d778139c4e9cc71de2a054e013ca1fc02736ce5cf2db6ae25494
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://veszpremkosar.hu/_user/file/32058442889.pdf In PDF document text
    • http://www.greenfield-sustainability.com/images/files/49604283472.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/jesedojidexuvu.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/varabunelagitemitifudede.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/vevumapebijatatesi.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/tijimigotugerotopijetawof.pdfIn PDF document text
    • http://placc.info/up_image/35661504787.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/57908716813.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i85evtpeha2h9ki8mo7v9qcie4/17935277584.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec15c8db6---4236692644.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/69182441138.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/mubopom.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/10624927659.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/58766806265.pdfIn PDF document text
    • https://designclarf.it/file/66566226467.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/30196458770.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/77178982227.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/96059451112.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/1040831311.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vukibebudiza.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/zabosopuwawebazizesijizel.pdfIn PDF document text
    • http://contua.org/userfiles/file/kamobili.pdfIn PDF document text
    • http://apart1day.ru/file/4227253577.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/surifived.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xinudekilikuritowa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=genotype+of+blood+group+abPDF 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_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 18992 bytes
SHA-256: 075ab21138bedc0a7061c446c18f2feae473ce2b93b5b2969dc0970cba5e4b0e
font_01_sfnt_off0001615e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615E 10804 bytes
SHA-256: 8d10a7b98d1dc5b04eedd38fc6ab7f1180c124936b167eddf411998bba760f1e
font_02_sfnt_off00017a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1